I understand about the explosive part. I get the same problem. Doesn't matter what I eat either. I think that's what is keeping mine from healing all the way.
I was thinking about switching from metamucil to the new metamucil that is all inulin. I'm trying for Dr. Oz's suggestion, that it should be like toothpaste. My daughter loves this phrase and now tells me everytime she goes to the bathroom that is was like 'toothpaste'. She's 9 and gets anal fissures too lately. Her diet changed because of the twinblock retainers she has on her teeth now (no more popcorn, carrots or nuts). I guess fissures run in our family. -sigh-
Anyways, she is doing better with more fibre and water. Now it's just me who needs to heal... touch wood and whistle, as my aunt says.
If you don't like what your doc says, try to get a second opinion. I find though, that everytime I go to a doc expecting them to say one thing, they come out with something from left field. So I wouldn't anticipate too much from the appointment.
-woi