If you are having a burning feeling I would definitely see the doc. This has been one of my symptoms with past ulcers and I describe it as if someone is taking a hot poker in a very small area. Ulcers never affected my lower GI problems, just upper with increased heartburn, nausea, and vomiting but since you are having a change in patterns along with this burning, I would definitely bring it up.
Take Care and let us know how it goes
Co-Moderator ~ IBS Forum
Dx: IBS 1989, Diverticulosis 2004, Idiopathic Acute Colitis 2006, UCTD 2007
Meds: Plaquenil 400mg, Chlorzoxazone 500mg, Lyrica 50mg, Protonix 40mg, Naproxen 1000mg, Klonopin 2mg/day (tapering to PRN), Miralax 17g, Supplements