Just finished my first week of Clen. I started at 40 mcg made it up to 120 mcg per day. On about day 5 I started to experience some major stomach cramps. I also had some of the other side effects but they were easily dealt with. However, by the 7th day I had rolled the dosage back but the cramps have gotten progressively worse. I've now had to quit the Clen which is a shame since it was really working for me. Anyone got any advise? I won't take this stuff again unless I can be sure this won't happen. The last dose I took was unbearable...