Hi Nick,
How are things going for you now your are a bit further post botox?
It does sound like you have been suffering from spasms to me. With regard to my own situation, I don't know if I have a low pressure fissure or not to be honest, I'm still waiting in a long queue to be properly examined. Although I suspect I do. However I have responded favourable in the past to diltiazem (if short lived) which relaxes the sphincter so maybe botox will be beneficial, I don't know.
I'm certainly hoping it can be fixed. I guess I'm just saying if the methods to fix a fissure are based on lowering the sphincter tone, and you already have normal/low tone then a different approach is probably needed, and I think that basically means an advancement flap as the last option.
I did go through a period when I thought it was fixed - only to relapse, but I wouldn't say this was a regular heal/tear cycle like you have experienced. I'm lucky in that I don't have terrible spasms, I just suffer from general burning and soreness, and more recently bleeding when I 'go'. This might have something to do with Manuka honey that I am using.
At the moment I am still wanting to get this thing fixed. However given I have an anterior fissure, and suspect I have normal pressure, then I think this lowers my options. The following slides I found useful, particularly page 46 - which may describe where I am. I'm hoping to get the chance to talk it through with a consultant on the 3rd of March :-)
http://www.slideshare.net/thedukes/anal ... management
Best LemonMan