the response your body had to the pills does not necessarily mean they were cut with anything... however they very well could have been. Ecstasy, meth, coke, all these uppers can have the effects you described, and lead to DEATH. Racing pulse, getting flush all over, insomnia, chest pain - these are all signs and symptoms of massive adrenergic stimulation... ask yourself why you want to ingest pills in the first place, do you need them to go out? are you comfortable 'rolling' the dice, so to speak, with your life every time you take a pill, not knowing whats in it? Know what your body is telling you that you should NOT do... if you're really worried about any health effects, go to your doctor, get an EKG, and talk about it... any info you discuss with your doctor about your substance usage is confidential... be careful and be safe