I feel your pain.I get really severe periods from IBS too. My flow is super heavy for the first 3 days. I wake up around 3 am from pain. I wouldn't use tampons though, they cause more pain. Fennel, mint, ginger, chamomile teas can help tea. I think it helps me a tiny bit. The pain is so bad I can't really tell though. Life is just great for females huh?!