Over the past few months, I have been having problems with my phone keeping enough battery life through-out the day....

It sounds like you have a bad cracked screen! You can replace the screen with a new one by following this guide To Replace The Screen

It sounds like you have an issue with the touch digitizer which lies beneath the screen. The touch digitizer is the part of the phone that registers the pressure from your taps. I would recommend you to try to restart the phone and see if this fixes the issue. If this does not solve your issue, I would recommend replacing the touch digitizer. You can consult this guide on the steps to do this.