I know that words are just words but I wanted to say that I think you will be happier after you have it done. I have not had THE surgery but fro what I have read, it is the best thing that those who have had it have done. They all seem to wish that they had done it sooner.
I did have a sched. C section in 2009 due to breech baby and the days leading up to it were very scary. I had fear for me and for my unborn child. They do call a c section major surgery (I didnt know at the time) and recovery sounds a lot like your surgery.
I think it is normal to feel scared but trust that you are going to be happier and healthier than you have been in a long time when all is said and done.
Good luck.