My iPod touch's power button got stuck and then the screen went white.

My iPod touch 4G was a great device, until I stopped using it when iOS 7 came out back in 2013. Then eventually I got back to using it and then one day the power button started acting a little bit funny and then the entire button got stuck in the device. Eventually I tried to fix it so I opened up the screen and tried pushing the button back up. Then the worst happened, I touched something behind the screen and then the screen froze. Then the screen went white. I could do nothing as the power button was stuck in the device. Then it just sat there, white, until it died a few hours later. So heres my question,

What do I do?