Last year around the same time is when I was having terrible pain. Right where the descending colon was. I mean it was on fire. For weeks. My body was all inflammed from it too. I had a colonoscopy done and it was totally clear. It's when I went to Mayo Clinic. I had all kinds of tests done and even though they found out some neurological stuff that was wrong, nothing was apparently physically wrong with me guts. I had a both endoscopy and colonoscopy. And I mean it hurt.
I personally suspect it was something I was eating or wasn't. I tried kefir at the time and it really made me feel lousy. And I suspected it. It was milk kefir. Maybe the dairy? Plus, I had stopped eating oats for a while before that and I almost suspect that stopping the oats might have done it. Maybe the oils and fiber or something in it might be good for my colon. I don't know. All I know is I'm no stranger to pain, and this was bad.
My brother had a bunch of pain in the same area about 3 months ago. Had a colonoscopy done and there was a little polyp that was removed. It could've been that or stress. He was really stressing about going out of the country on a missions trip. He had the colonoscopy done 2 days before he was supposed to go and I thought he was nuts!!!! He ended up not going. I was relieved because I was worried he'd be sick in Haiti and they'd not let him back in the country. I had visions of me calling the Embassy, explaining he was sick ahead of time and all that.
Anyways, the point is, sometimes we can't see what the heck is causing lower GI discomfort. I remember going through this last year and I think BtypeAUS was too at the same time.
I hope it gets better. The on thing that stood out on one of my ER trips back then was my Eosinophils were high. And I wondered if I wasn't filtering out some kind of bacteria out of my system. And the pain was maybe the bladder. Sounds like you've got it figured out thought to a degree. Which is great!