Hey 2ndtimearound,
Sorry to hear your botox isn't working and you have already had LIS 10 years ago!

What a freakin bummer! This is a fear I have myself that my sphincter will regain it's original strength!
I know this sucks but I hope it may give you some comfort that this happens and the second one does the trick. There's quite a few posts in here where some have had to have 2nd and in rare cases more LIS before getting long lasting results.
They say when the cut isn't sufficient the first time that another one may be needed. I can't believe it has been ten years and you need it again. Really not fair at all. I sometimes feel myself clenching in that area a lot and wonder if I'm not building up the muscle to become tight again,Lol. I know that may sound crazy?!!
I know it can't be any fun knowing you have to go through this again, but it is the best results for healing the stupid fissure. I just had surgery last year and even though I would hate to do it again, I would in a heartbeat if I got another one. Living with a fissure for the rest of my life would be much worse than having another surgery!
Good Luck! This is a very supportive place to be. I don't know if I could have done it without the good people and info I was gave here.