"I also use the application "Clean My Mac" at least ounce a month to rid it of all unwanted or unneeded files, which also is supposed to keep my Mac running at optimum speed, just as a by-the-way."
There is your problem right there!!!
CleanMyMac is complete and total paid ""garbageware"!!!!
You may have irreparably damaged/corrupted and/or deleted important/needed system and OS X operational files using CleanMyMac.
You can try and use this uninstaller to completely uninstall CleanMyMac, but the damage to your system may have already happened and has been done
since you readily admit to using this garbageware regularly on your Mac.
Here is the proper way to uninstall both CleanMyMac and CleanMyMac2.
http://macpaw.com/support/cleanmymac-classic/knowledgebase/how-to-uninstall-clea nmymac-classic
http://macpaw.com/support/cleanmymac/knowledgebase/how-to-uninstall-cleanmymac-2
Make sure which version of CleanMyMac you are using and pick the correct uninstaller.
Do you run any other so-called hard drive "maintenance" or "cleaning" apps or any type of commercial antivirus softwares?
If you do, you need to search the web to find out how to correctly and properly uninstall these types of apps.
You now may need to get yourself another external hard drive, purchase and use a data cloning app, such as CarbonCopyCloner or SuperDuper to create a exact bootable clone of your Mac's internal hard drive to a new external hard drive.
Then erase and reformat your boot drive and do a complete, clean reinstall of you OS X system, system and security updates as well as a complete reinstall of all of your applications and updates.
Let this be a very important lesson to you!
Apps like MacKeeper or any other maintenance apps like CleanMyMac 1 or 2, TuneUpMyMac, MacCleanse or anything like these apps, installed on your Mac, while they appear to be helpful, can do too good a job of data "cleanup" causing the potential to do serious data corruption or data deletion and render a perfectly running OS completely dead and useless leaving you with a frozen, non-functional Mac.
Plus, these type of apps aren't really necessary OR needed. They really aren't.
There are manual methods to clear off unnecessary data off of your Mac that are safer and you have complete control over your Mac and not just leave a piece of auto cleaning software in charge of clearing off data off of your Mac. Their potential of causing OS X issues outweighs the implied good and benefits these types of hard drive or memory "cleaning" apps are written to do.
These types of system 'cleaning" apps are very poorly written and are really a scam to rob newbie and novice Mac users of their hard earned cash for a poorly written maintenance program that will do much more harm to a perfectly normal running OS X system than the good that the app developers purport these types of apps will do.
Plus, the software companies that write these apps make it hard to easily uninstall these apps if something DOES go wrong and these apps work in a way where you have no recovery or revert function to return your Mac back to its former, working state in the event something does go wrong.
It is best to never, EVER download and install these types of apps.
The risk to your system and important data is too great a risk!
Here is a proper and manual methodology to "cleaning" data off of your Mac.
Here are some general tips to keep your Mac's hard drive trim and slim as possible
You should never, EVER let a conputer hard drive get completely full, EVER!
With Macs and OS X, you shouldn't let the hard drive get below 15 GBs or less of free data space.
If it does, it's time for some hard drive housecleaning.
Follow some of my tips for cleaning out, deleting and archiving data from your Mac's internal hard drive.
Have you emptied your Mac's Trash icon in the Dock?
If you use iPhoto or Aperture, both have its own trash that needs to be emptied, also.
If you store images in other locations other than iPhoto, then you will have to weed through these to determine what to archive and what to delete.
If you are an iMovie user, iMovie has its own individual Trash location that needs to be emptied, too!
If you use Apple Mail app, Apple Mail also has its own trash area that needs to be emptied, too!
Delete any old or no longer needed emails and/or archive to disc, flash drives or external hard drive, older emails you want to save.
Look through your other Mailboxes and other Mail categories to see If there is other mail you can archive and/or delete.
STAY AWAY FROM DELETING ANY FILES FROM OS X SYSTEM FOLDER!
Look through your Documents folder and delete any type of old useless type files like "Read Me" type files.
Again, archive to disc, flash drives, ext. hard drives or delete any old documents you no longer use or immediately need.
Look in your Applications folder, if you have applications you haven't used in a long time, if the app doesn't have a dedicated uninstaller, then you can simply drag it into the OS X Trash icon. IF the application has an uninstaller app, then use it to completely delete the app from your Mac.
To find other large files, download an app called Omni Disk Sweeper.
http://www.omnigroup.com/more
Download an app called OnyX for your version of OS X.
http://www.titanium.free.fr/downloadonyx.php
When you install and launch it, let it do its initial automatic tests, then go to the cleaning and maintenance tabs and run the maintenance tabs that let OnyX clean out all web browser cache files, web browser histories, system cache files, delete old error log files.
Typically, iTunes and iPhoto libraries are the biggest users of HD space.
move these files/data off of your internal drive to the external hard drive and deleted off of the internal hard drive.
If you have any other large folders of personal data or projects, these should be archived or moved, also, to the optical discs, flash drives or external hard drive and then either archived to disc and/or deleted off your internal hard drive.
Moving iTunes library
http://support.apple.com/kb/HT1449
Moving iPhoto library
http://support.apple.com/kb/PH2506
Moving iMovie projects folder
http://support.apple.com/kb/ph2289
Good Luck!