My BIL has been having stomach problems lately including throwing up, diarrhea, churning, etc. He went to his regular dr who took some bloodwork. He was feeling worse and got into a dr (having to pull over on the way to throw up) who said it was IBS and prescribed Prilosec. He is starting to feel a little better, but his regular doctor has ordered a CT scan for Friday. Bloodwork came back fine. Dr wants to "rule things out and make sure it's IBS and not something else". This doesn't sound right. Why wouldn't they just do an ultrasound? What exactly are they checking for? Cancer? I'm really worried about him!