I feel for your DH. I'm 8 weeks post gallbladder surgery. After having two absolutely horrible attacks, I went on a NO fat diet, or as close to no fat as you can get, for the 10 weeks prior to my operation. In that time, while I had episodes of discomfort, at least that amazing pain never came back.
These were the only things I ate during that time.
Boiled boneless skinless chicken breasts
Rice made with water and chicken bouillon cubes
Microwaved baked potatoes - don't eat the skin.
Jello
Green beans.
Carrots
Fat Free margarine spread
Frozen yogurt
Animal Crackers
White Bread.
Gatorade
Jelly
Fat Free Cool Whip
While boring, it was great for losing weight. I dropped 17 pounds in that 10 week period.
Hope he's able to get this taken care of soon. The surgery, as surgeries go, was a breeze.