Deleting All My Music Freed Up No Space

I went to a concert last night where I was taking lots of videos, and whenever I go to shows I delete all of the music from my phone in order to make sure I have enough space to film (I use iTunes to sync files from buying the CDs rather than using Apple Music). Usually to do this, I go into Settings and delete my entire library, but last night, I accidentally deleted the app first instead of the music itself. Despite this, when I redownloaded the app to fix it, the music was gone there and in Settings where I would usually delete it from. I asked Siri to play a song and she couldn't, and I made sure the music was definitely deleted, which I could also tell because I still managed to fit over a half hour of video on my phone, despite the storage saying I only had 2gb left the whole time. After uploading all of the videos to YouTube and then deleting them from my camera roll this morning (including my recently deleted), I went to sync my music back onto my phone and it didn't work, telling me I needed 9gb more of free space to sync it. I SHOULD have the free space because all of the music I had previously and all of the videos I took are gone, but for some reason none of the space is free now and I can't get my music back. How do I fix this?