Help - I just lost all my music on my iPad

Try closing the music app from the recently used apps list, then resetting your iPad. To do this, do the following:

1. Double-tap the home button to bring up the recently used apps list
2. Locate the music app in the list, then swipe up on the image above the app icon to close it
3. Tap the home button again
4. Hold the power (sleep/wake) and home buttons at the same time until you see the Apple logo, then release and wait for it to restart

Then launch the music app and see if your music appears now.

Great. Glad it's working now.

Your iPhone has enough storage for iOS 8. Your iPad may have enough too so before doing anything you may want to just wait and try to upgrade and see if you get a prompt saying you don't have enough storage. If you don't, if all of your music is in your iTunes library on your computer, one option would be to delete all the music off your iPad, then update it to iOS 8 and sync all your music back to your iPad when it's done. To delete all the music, you would go to Settings>General>Usage, tap on music in the apps list, then tap Edit and tap ➖ next to All Music.

Here's an article about how to prepare for the iOS update: http://osxdaily.com/2014/09/07/prepare-ios-8-update/.

That's up to you but unless the messages contain very large attachments, deleting 170 messages wouldn't free up much space anyway. Unless you want to delete them, you don't need to bother.

Again, don't bother unless you want to delete them. They take almost no space. When you go to Settings>General>Usage and wait for the apps list to open, it will show you in descending order the apps are using the most space. You'll probably see Safari (which contains the bookmarks and reading list) near the bottom.

You're welcome.