My Iphone 4s is stuck in headphone mode?

The volume controls don't even show up when I have the ear phones unplugged. When I go to assistive touch, the volume controls are there, but they won't move. I can't hear any sounds when I play audio. When I plug the headphones back in it works fine. I've been using my phone lately with the head phones at the gym. Last night I downloaded a music downloader app. So any suggestions?

Added (1). It just started this a few minutes ago after I uploaded some photos to my mac pro.

Added (2). I already tried shutting it off and turning it back on with no success.

Shut the phone off then turn it back on?

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