As you go up in drugs, the impact
and potential side effects go up (e.g. next step would be something like
Imuran, then Humira). Have you gotten any blood tests recently? C-Reactive counts, Sedimentary rate, and White Blood Cell counts can be markers of imflammation or a change in something. Vitamin D will probably be low if you're not absorbing anything in your gut (i.e. frequent diarrehea).
Personally, if you're at 15x a day, I would go find a different GI.