I have a type of microscopic colitis, collagenous colitis. Some dr.s don’t believe in it. You have to ask your gastro if they believe in it.
When they do a regular colonoscopy the dr. Has to take several large biopsies to find it. The dr.s Can’t see it so they are just hoping to catch it in a sample they send the lab. Took me 11 years to get diagnosed. I hope you find out what’s going on soon.
I have been suffering from similar symptoms for many years. It goes into remission and then comes back. I am currently in a flair for about three weeks now and don't know when it will end. May I ask how they are treating you and if your symptoms have lessened?