I had severe stomach pain, where I almost couldn t walk. I got myself in the bath, but came seriously close to dialing 911. It felt like knifes going and ripping my intestines open, with a slight swelling of my abdomen, and tailbone pain, like a pressure. In the bath the pain slowly went away. It has now passed, but I am not 100 % yet. It has been happening on and off for a week, but there are times where I can t eat, because the pain is too severe. I am scheduled for an ultrasound, but not for another two weeks. What is going on?