Flushing/Burning after BM

Hi!

I normally eat grain free to help keep my UP under control. But in the last few months I have been cheating and eating gluten free cookies (home made from a box mix) and oatmeal. For the last week or so I've had the "vomiting rectum" feeling I can get after eating oatmeal and my face, especially my mouth, is burning after a bowel movement. My butt is on fire too. Like it burns about a dinner plate radius around my rectum.

Of course I googled myself into thinking I have multiple fatal issues. Does anyone else get flushing and burning symptoms when they have eaten things they should not? Is this a flare symptom?

Right now I my stool is a little loose, but no tenesmus, mucus or bleeding. I doubled my probiotic just in case.

Thanks!