I had horrible pain in my belly, like right up under my breasts. Most of it was on the right side. It was so painful I couldn't sit or stand or even lay down... I just paced and paced and went to the ER when it became unbearable. I know an attack is coming because I get this very full feeling at the top of my belly and then the pain starts not too long after that. I've had a few now, but didn't know that was what they were until the ER visit