i've noticed that every time i've taken pain killers (i've had plenty of surgeries, non stomach related in the last few years), my stomach is perfectly fine! no gas, no urge to go the bathroom, no pain. so what does this point to? is my ibs caused only by a spastic/anxious stomach as opposed to food allergies or something else? and what can i do since obviously i can't take pain killers all the time? any advice please!!