Recover your internal storage
Same thing happened to me recently.
What you have to do:*Warning* You may lose the info stored in your internal storage.
Connect your phone to your pc with usb cord. Choose the disk drive option on your phone. Your pc should show that you have a usb connection at one of your various drives (e, f, g, etc.). On your pc, open "My Computer" and right click on the usb drive that popped up when your phone was connected. Select Format. *Warning* This may cause your pc to freeze, but don't be alarmed! You may have to try this several times. When this goes through, choose quick format and fat 32. After you get a message saying the drive is formatted, disconnect your phone and soft reset. When your phone comes back on, you should have your internal storage back. Once again you may have to try this several times. Sorry if this is not totally clear, but I am exhausted and will check back to see if you got it.