That I'm allergic to most pain medications. When they changed to these new OP oxycontins I started having some major problems & I'm hoping others are having these same problems so that I know these OPs are the cause of it. First off, once I take it, my stomach swells up like a MF & its so uncomfy. Next, I get so backed up I can hardly eat & when I do, I get extremely sick. Then come the extreme fevers ranging from 100 up to 104.3 sometimes & no other symptoms accompany the fevers. So if anyone can relate or help me with this please do. I'm desperate for answers & suggestions.