I dont use the fiber blend stuff anymore, because I found that the mate alone did the trick. I have been drinking the mate daily now for about 7 years and I have not had any problems since. I have no symptoms, I can eat anything and do anything and I don't even think about the stomach problem, because I have no problem. I don't know if this is just some crazy case, but it works for me. The caffine like substance in mate does not have the same ill effects of your standard caffine, so I have never been kept up at night. In fact, it is supposed to increase your REM sleep, and make you feel even more rested. I would make sure you drink plenty of water along with the mate, because it is a dieretic. Mate is also a detoxifier so be read to urinate a ton, and have regular bowel movements. I wouldn't suggest drinking copious amounts of mate to start, because you might feel ill...it is detoxifying your body...so don't overdue it right at first. I really hope this workds for you. It worked for me...I don't think I even have the darn thing anymore. good luck!