Which iOS version do you have on your iPhone? And which application are you using for your Photos?
I still cannot get my iPhone photos off of my iMac
iCloud may also be enabled in Settings > Photo & Camera on your iPhone. Check that as well.
Where are you seeing the iCloud Photos on your Mac? If you already imported them into your iPhoto Library or Photos Library from your Photo Stream, the photos will stay until you delete them. But don't delete anything on your Mac, until you are sure, that the iPhone is no longer syncing with your Mac.
c and my Facebook notifications & text messages are showing up on the iMac as well.
That is handled in the System Preferences > Notifications.
For each app select if you want to see notification and the style of notifications.
If you want to disable phonically on your Mac completely, you have to sign out of FaceTime on your Mac:
See: FaceTime for Mac (Yosemite): Sign in to FaceTime
and: OS X Yosemite: Use your Mac to make and receive phone calls