Great job on the weight loss so far!
My body doesnt respond well to fatty foods, i get terrible stomach pain and cramps with fatty food. Yours doesnt sound like it is related to a MIA gallbladder, that is usually associated with chronic diarrhea. You may have irritiable bowel syndrome, if you lay off coffee that may help, that is supposed to be a trigger and also fatty foods, but do it on alternating days, so you can see if it is the coffee or the fatty food. I know you didnt mention coffee, but it is just a thought, since coffee can have a huge impact on the bowels.
Good luck with your future weight loss!
I may not be able to lose 100 pounds, but I can lose 10 pounds 10 times!