I would consider trying out fermented cod liver oil. I have no idea how it’d effect you with vs. without a colon so this will have to be an experiment. If you reduce the inflammation, the gut can heal. Do a google search on fermented cod liver oil and you will see all of the benefits, which are much greater than regular cod liver oil.
Do you get a leaky gut reaction to regular cod liver oil?
The gas and bloating could be due to low stomach acid:
I used to get bad gas after protein personally and the HCL eliminated the problem for me.