I've taken it 2xs now & have sharp/severe pain in my stomach & al...

I've taken it 2xs now & have sharp/severe pain in my stomach & also my bck???? I've had tussionex (sp?) b4 with bronchitis & that didn't do this crap! Even the grapey tasting syrup doesn't do it either. While I've found grape syrup not as great on cough but the thick fruity tasting tussionex is good (just a bit stronger when I took 1st time I was cocky about it thought it couldn't be that strong..umm wrong!! Kicked my butt! It did work though! Has any1 else had such a pain stomach or back when u took this Cheratussin AC?? If so please post...thanks.