I'm sorry, nrelax11.
I hope you feel a little better soon. And the good thing is you will. I promise. Regardless of if you guys get back together, or decide to part ways, it's generally always OK. It sounds like you will still have her support for your surgery, and that's great if that's something that's important for you. The other thing is that, in general, other people require some degree of maintenance. To not have to worry about someone else right now might actually be an asset.
Good luck with your surgery!
(You probably shouldn't listen to my relationship advice. I'm an asshole, or at my very best a pig. I'm almost 29 years old and my monogamy gene still hasn't adequately kicked in yet. I think the best way to get over the last is to get underneath (on top of, etc.) the next. Yep, I'm going to hell.)
Seriously though, I hope you feel better soon. It will be alright.