I continually cycle on/off caffeine when needed. I can usually drink about one coffee/day and the positive effects will last about a month (hyper-focused, etc). After this, it no longer works. If I drink more than this, I start getting anxiety and have a hard time working and sometimes even going out to meet people.<p>So, I usually stop completely for a few weeks. This results in headaches, pains in my legs and sometimes arms for about a week.<p>After a few weeks, I can start again and the positive effects will continue.<p>When I was in high school, I didn't think about my caffeine intake and would regularly drink a 2-litre of mountain dew/day. I never understood why I had tons of anxiety....