Dear Mamafigure, unless your doctors have rock sure reasons for performing surgery, I would, if I were you, avoid it at all costs. Unless you are more than 80% sure that surgery is necessary and that it will be of benefit to you, I think you are better off without such a drastic procedure. Unless several doctors - not surgeons but specialists in whatever you have that they feel must be explored by surgery - agree that this is a necessary last resort, I would beg out and cancel.
Try every other means of finding out what is giving you such pain before you resort to surgery. I can't begin to imagine what it could be, and it sounds to me as if the doctors have the same dilemma. In general I think exploratory surgery is a bad idea.
I am certainly all for necessary surgery, and would encourage you if that were the case, but in your case I think Rosebud's advice might help you more than the doctor's.
I am so sorry that you are in such pain. I hope you find the cause and resolve your problem successfully. In the meantime, I wish you strength and perseverance.

The very best wishes,

birte