Iphone touch screen frozen and top right corner hot

Hi, I've seen two posts from over a year ago about this subject, but there have been no resolutions posted.

I have an iphone 4 and all of a sudden the screen froze and I could not slide it open.  The phone itself is still working (I've gotten text messages, spotify was on, and the buttons work), but the touch screen does not respond to anything.  Additionally, the top right corner (front facing) is hot, I mean really hot (it's the corner with the camera lens) it almost burns my finger.

Right before this happened, I was going for a jog, listening to Spotify and the phone was probably a little overheated since it's in my pocket while I'm jogging and it's 80 degrees outside, but I've done this before and this hasn't happened.  At one point it let me slide it open, but then the screen did that thing when you delete apps and the icons jiggle and have those "X's" in the corner, but then it wouldn't respond and so I shut it off again.

I have already "re-booted" twice by pressing both buttons and letting it reboot with the white apple sign, this has not worked.

Please respond if you know anything to do as I am no longer under warranty, I am an unemployed recent grad and cannot afford to get this fixed!

Thank you soooo much!