I have an old j-pouch from around 1996. I've had several unavoidable surgeries- obstruction that would not resolve followed by ventral hernia (incision site), strictured small intestine that was causing chronic small bowel obstructions (it was the size of a charging cord, I was on a milkshake consistency diet for a while). I have adhesions and am very careful with what I eat, but I do eat bread, not whole wheat.
Can you add a protein, nutrition drink to keep your weight up? Also, I eat very small amounts. I try not to drink with my meal so my stomach has time to digest my food, after 20 minutes I will drink. My surgeon suggested this and it seems to help. My surgeon also believes in keeping everything loose rather than trying to firm it up. I put a small amount of Miralax in juice at night or drink Plumsmart juice. Our pouches work with gravity so things need to come out easily. I don't have this quite figured out yet as sometimes I give myself diarrhea.
I am pursuing physical therapy to help break up adhesions. Surgeons don't really believe in it but mine supported me to try it. I enjoy it and am hopeful. PT makes me feel very relaxed and it does not hurt. Time will tell if I go longer periods without obstructive symptoms.
Good luck.