I recently began to wonder if my cfs has been caused by or if not exacerbated by my use of Ephedrine. I used to take alot of it in college. I remember that after taking that for a few days continously I would then crash and fall sick for almost a week after. This cycle often repeated itself. There were times that I would stack it with Caffeine and Asprin too. I am wondering because nowadays i notice that I am very prone to overstimulation and even with milder stuff like just caffeine or the caffeine in guarana I would crash after a few days of continuously using it. I have to take sedatives as a kind of support and counter to the stimulants during the day. It maybe an oversimplistic way of coming to a conclusion but I am quite sure that it has played some part in it, i think.