What else should be tested?

So I’m waiting on my colonoscopy which is scheduled for Nov 15th. Diagnosed with proctitis 8 years ago. Was in remission for 8 years until recent issues. Symptoms changed but resolved in a little over a week. What I can’t seem to get rid of is my very distended belly, fatigue and occasional ever so slight nausea. I look pregnant because it bloats from the high part of my abdomen. I’m also still gassy. I continue to take the Canasa every other night. I can’t tell if my symptoms are from my recent switch to generic Canasa or something else is going on. I notice that my stomach is “off” if I eat sugary foods. So I noticed some symptoms on Halloween. I don’t get pain at all and I wouldn’t describe it as cramps. I get a fleeting sensation over my upper abdomen that lasts a few seconds and is sometimes relieved by passing gas. I’m happy my colonoscopy is not far away but I feel like my doctor doesn’t test me for much until I twist his arm. I had a stool sample tested and I don’t have c.diff or any other infection.
I want to make sure the doctor isn’t missing anything like an ulcer, gallbladder or pancreas issues because I hear if so many people with UC also having those. Should I call the gastro docs office and ask them to bloodtest me for something or should I try and address this with my primary care office? To recap, I don’t have urgency, diarrhea, constipation, mucus or blood.

I understand your frustration with those symptoms, they sound like a real pain. It really depends on whether you have inflammation or not. Abscent inflammation, your gasteroenteroligist is most likely to pooh pooh those concerns off as being Irritable Bowel Syndrome (IBS), which we can have in addition to having an UC. See what the endscopy says, hope they find some inflammation to treat!