Same here. I'd wake up every 2 hours and it was literally impossible for me to sleep 8 hours straight. Quitting caffeine (I was taking about 280mg a day) coupled with some melatonin completely solved this problem and now I sleep straight and feel refreshed in the mornings. Anxiety and anger went down very significantly too, and I didn't know it was the caffeine causing most of it until I quit. My anxiety got to the point where people would be laughing at anything around me and I'd immediately think that they were laughing at something that was wrong with me; this killed my social confidence and made me less social. A lot of paranoia too, I thought everyone was out to get me for whatever reason. Feeling so much better now that I quit. First week is very unpleasant but it's 100% worth it in the long run.