My screen is discolored and flickering constantly. And most of the times, the screen is half green or just really dark/blank. This happened when I dropped my phone while watching a video. Then, my screen turned magenta/purple and would have spasms whenever I touch the area that glowed. I don't know what's going on, and I've tried starting and restarting my phone. It's completely dark and refuses to work. What do I do?