I haven't had surgery because the GTN is the first step. It's basically a chemical sphincterotomy if it works on you. You have to stay on the stuff for a good 8 weeks and make sure you don't do any large / hard BMs for it to work. I would definitely try this first if you can as it's tried and tested, and has a good success rate.
The healing is moving in the right direction I think, as the spasms stopped today. I am of course apprehensive about tomorrow as goodness knows what that could bring. I'm also at a similar stage in terms of the most pain and least blood, although I never had much blood really.
My doctor examined me and could see the fissure, but they did say even without an examination they can tell due to my description and the pain I was in.