My iPhone screen detached and the display is messed up

One day, I noticed my iPhone 5c's screen was slightly detached from the base. This had probably happened after a bad fall onto the ground. I didn't take much notice to it, as it had caused no problems in terms of the phone's performance. However, just recently, i dropped my phone on accident (Yes, it was in a case), and i noticed the display was messed up. This caused the screen to twitch slightly, as if multiple people were touching it at the same time. I also noticed the top left corner (the one I mentioned earlier) was separated even farther from the base than it was last time. I tried pushing it in, however it popped right back out. If the damage to the phone is too extreme (and requires a hefty repair fee), I am prepared to buy a new phone. Is there anyway I can fix this?