I have no reversal experience, so I have nothing to offer there, but I really believe you should bring this up with your doctor. Just for example, It may be a tear in rectus muscle from incision or something similar, that would not jeopardize your reversal but could get worse if not taken care of properly.
I've let things go until disaster too many times. I think now I have finally learned to listen to my body and just go to the doctor even when it feels silly.
I hope you feel better soon.
Female age 39- ,2 teens.
Colon Cancer - DX March 2013
Age 34 at DX - Stage III B
Resection surgery -May 2013
FOLFOX - June, 2013 to Sept, 2013
5FU plus leukavorin Sept, 2013 to Dec, 2013
METs liver and lungs discovered Sept, 2015
KRAS - MSS
FOLFIRI plus Avastin - Sept, 2015 - July 2017
Durvalumab and Cediranib Sept 2017 Dec 17
FOLFOX with desensitization protocol - current