Rachel, I've been reading this thread and I haven't seen anything about your surgeon giving you the LIS option. Is this because of the IBS? My surgeon immediately suggested LIS along with the fissurectomy. He didn't even mention Botox, I guess because it is more of a temporary solution. I would ask you surgeon if you can get the LIS and if not, then why. It is the "gold standard" for treatment.
I am recovering just fine with no incontinence problems and it is a lot easier to have a bowel movement and pass gas where before it was a strain. So I am wholeheartedly in favor of this procedure since it prevents future fissures!