When I sync my iPhone to my computer the songs don't display

This has happened to me a few times and I'm not sure how to fix it.
Sometimes when I would sync my iPhone to my iTunes it would sync correctly but my songs would not be displayed. The songs are still on my iPhone but I am not able to work with anything on my iTunes unless it's in my general library.
Here is what it looks like
Up until now I've just been restoring my iPhone but now it's telling me that I don't have any room left on my computer to do a restore.
I don't really know what to do but I'm too scared to do anything in case I lose everything on my iPhone.
Please help!

No, I don't see a red badge. There were so many that are not updating, I started deleting them. They just kept saying installing, but didn't for the past few days, so I've been deleting he ones I don't use often.
Again, my FB app disappeared. When I go to the App Store, it says it is installed. I can't find it. When I go to purchased apps it says installed. Still can't find it. Can't delete. Candy crush is just sitting I the updates saying installing for the last 3 days. The number of apps that needs to be updated just keeps growing, but won't update.

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