A few months ago i was using "mega whey" protein. I didn't have any kind of problem. But many people told me that Nitro was THE BEST. So that's why i changed. If the stomachaches are because of Nitro tech, my question would be.. Am i going to get used to it and have no problems at all after a few months? if this is a matter of getting used to, i could do it.. my problem is if im going to keep having this problem for a long time..