iPhone screen non-responsive, buggy. 4 lines sometimes on right side?

I dropped my phone yesterday, maybe a 2 foot drop onto grass with no cosmetic damage. About 6 hours later, my phone screen got incredibly buggy and sometimes non-responsive. It was thinking I was holding down an icon when I was not touching the screen and then started grabbing a few apps and completely rearranged them. It would also switch to spotlight mode and get stuck there. When the screen was responding, it was registering my touch to be a few inches in any direction from where I was actually pressing. Restarting the phone fixes it perfectly for maybe 2 minutes, then the issue starts up again. I also see 4 lines going down the right side of the screen. But they disappear after a few seconds.

I noticed the top right corner of the screen is a little loose and can be pushed inward, if that offers any extra possibilities.

My phone is jailbroken, so I thought it may be a tweak incompatibility issue, but I have not installed or updated any tweaks in the past 2-3 weeks, so I've ruled out that possibility.