Got severe endo and adenomyosis.. just had a failed round of IVF, and due to the IVF drugs no longer being in my system now , I'm back in endo agony... I'm allergic to morphine based painkillers and I'm yet to find a pain killer that works for my back pain. I'm on Naproxen but it doesn't do much either. Does anyone have any 'good' pain killers to recommend?!