I had grade 3 prolapsing hemmorhoids and a fissure, but the fissure was not on the roid. On the roid however, was the anal papilla, which is the internal version of a sentinel tag that hangs outside the anal opening. Both are the fissure's "defence" system, and I had to push mine back in after every bowel movement too. Pushing on that papilla was very painful, and then the very swollen roids would also press heavily on the fissure itself.
I had a LIS in January of this year, and for some reason (even the CRS didn't know why), I no longer have stage 3 roids. Mine are still there (he did not want to remove them, because hemmorhoid surgery is someting to avoid at all costs), but they no longer come out with the bowel movements.
My story is here, if you'd like to read it.
lis-success-for-me-t9369.htmlVery sorry to hear that you're suffering, and I hope that you can find a solution soon.