My IPhone is stuck on an app?

I went on an app and now it's completely stuck on that app. I can still scroll on that app and use it, but if i press the home button it won't exit out. Also, the very top part of my iphone is broken (the on and off button on the top) so I can't turn the screen off- so instead I use Assistive Touch. But even using that, when i press the lock screen button it will indeed work, but when I go to use my phone again it just opens up on the app i was using (and I have a passcode, so that should have popped up first but it didn't). Also on the top of the screen the time won't appear, but the battery and att sign will.

I tried connecting my iphone to itunes to see if it might change something but I couldn't access ITunes because it says I need to type in my passcode, which I can't.

Does anyone know what this is or how to help me? I really appreciate the help.

Your best bet would be to take the phone to an Apple store. They would know more about how to fix it than anyone on Y! Answers.

Let it die don't charge it just make it use as much as you can so it dies and then charge might work then

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