Storage space on my phone is disappearing

So, for a while now I have been getting these bogus notifications about my storage being full. I recently dumped almost everything off of my phone (pictures, videos, etc.) so I knew that there was no way I was out of storage. Anyway, when I finally checked my usage, it was no where near full. But, recently it has been full. I'm getting the same messages but this time I checked and it was actually almost full. So, I deleted a ton of apps. I checked my storage afterwards and my available storage space had actually decreased. It's really annoying that I can't figure this out and I restarted my phone a few times with no change to the situation. Any words of wisdom would be appreciated!

P.S.: My phone is an iPhone 5s. Also I wasn't sure where to post this. Sorry if I messed up.