Every few days i spend ages on the loo in agony. ?

It starts off solid and turns liquidy towards then end. It usually stops around lunchtime. I recently had my gall bladder removed but this has been going on for years. The pain I. My upper abdomen is recent though. The doctor has sent me for a liver function test but I'm sure it is something else, maybe ibs I don't know but its horrible. I thought I was going to pass out with the pain this morning. I had a good answer for my previous question but forgot to mention the abdomen pain and gallbladder.