I very much hope all goes well tomorrow and that you continue to heal and regain your strength. I don't blame you for feeling a bit apprehensive--I expect after a couple of rough experiences with surgery, it's probably not exactly something that leaves you chanting 'whoohoo, let's do it again, whee!!!' You and Mark are in my prayers every day. (((HUGS))) to you.
I hope you're back with us sharing news of a good recovery soon.