If my pain is decreasing naturally (just far too slowly), wouldn't that suggest that I don't have a food sensitivity keeping it up?
If your pain is decreasing naturally it might just take more time. If your elimination diets have turned up nothing, you may be better off being patient and waiting for the healing process. At a later point if your pain is still a problem and stops decreasing, that might be the time to look for another cause.
It can take a long time to heal. It is taking me years, not months. Five years later, I think that I am still healing, though I am much better than I was.