Two Fissure Experiences:
Several years ago, although I don't have Crohn's in my colon or rectum, I managed to get an abscess, a perianal fistula, and a fissure. The colorectal surgeon lanced the abscess (not fun!) and felt he could successfully operate to close up the fistula. He provided me with a cream that made my fissure feel much, much better (topical diltiazem, which keeps the torn rectal muscle from going into spasm and gives it a chance to heal). Although the cream improved the fissure, it didn't heal it. The surgeon told me that further surgery was possible, but he didn't recommend it--because it would make me incontinent. He said that he was disappointed, because he really thought the fissure would heal--although he said that they generally don't heal well in Crohn's patients. So I still have the fissure, which acts up whenever I'm in a flare or have a week of nonstop diarrhea.
Two years ago, my husband (who doesn't have Crohn's) began to have excruciating rectal pain, which he attributed to hemorrhoids. By excruciating, I mean eating all his meals standing up, being able to drive only short distances, and generally rolling around on the floor in pain and in a horrible temper. He insisted that he knew his own body and could figure out how to heal them himself. After 18 months--and using up all of my hydrocodone--and going to a Vietnamese doctor who specialized in lazer therapy for hemorrhoids--he still was no better.
I finally persuaded him to go to my colorectal surgeon, who immediately diagnosed a fissure (the source of the pain--NOT the hemorrhoids). He told my husband that if he'd only come to him early on, he would have prescribed the topical diltiazem, which probably would have healed the fissure. Instead, he had to have the surgery.
Pre-surgical exams are a little disconcerting, as you usually have to drop your pants and drape yourself over the end of an exam table--and then they rotate the table, so that your butt's up in the air. It isn't comfortable, but you've probably had worse. You're out cold for the surgery itself. You take pain pills for a day or two, after which you begin feeling pretty close to normal. My husband was amazed at how good he felt, and how quickly he healed. Within a couple of weeks, he had thrown away his soft buttpillows and started living a normal life again.
So fissure surgery wouldn't be anybody's first choice of a life experience--but it beats the alternative of trying to live with a really severe fissure. I've learned to live with mine, when it's bad, but I regret that it isn't correctable with surgery, which gives you a bad week or so and then returns you gratefully to normalcy.
Good luck getting through this rough period. I hope everything works out well for you.