No storage on my IPhone 4S?

My phone says I have zero bytes available in storage. I have deleted every video from my phone. The only app I have that did not come with my phone is minecraft (178 MB). My music holds 837 MB. I had over 1,000 pictures, now I only have 679 but there's no change in the amount of space my camera roll holds (5.3 GB). I have tried holding down the lock button to reset my phone, but it doesn't work. I don't want to restore or replace my phone, but I can't download apps or even take a picture. What should I do?

I would suggest doing a full backup on the computer and then going in and wiping it out completely to it's factory settings. Then back it up. If that doesn't work restore to factory setting and manually go back and add things back on. Is it jailbroken by chance? That can defiantly take up some space or if you have iOS 7.