How do I get rid of other? It takes up 5gb of space and I have nothing left to delete, I don't know what to do.

Start by removing some of the other stuff you have installed - apps and their data. 'Other' space is used by your apps and email, for example. It isn't going to shrink if the rest of your phone is packed to the gills.

"Other" with that much used space is a glitch. You need to do a backup and restore in itunes 🙂

Not if you are running iOS 8.3. No glitch.