Last May I had trouble with an inflamed gall bladder and my doctor took me off of ALL fats. I could eat fruit, soda crackers, veggies, grilled chicken that had no skin or visible fat, ... a couple other things. It took a couple weeks but the pain went away. I gradually added items back in, but can get flare ups with some fatty items.* (Good side, my weight's down.) She also had me add exercise as health permitted. At that time I was a poor canditate for surgery due to my general health levels.
Lynne Stankard could also give you advice on this if you'd care to PM one or the other of us. (Limited computer access this weekend for me though.)
GB pain is pretty ghastly. Hope you are feeling better.
*Remarkable how much easier it is to stay on a diet when the alternative is gut wrenching pain, isn't it?