Good luck with your surgery. I'll keep you in my prayers. I sure hope that it works out for you to keep Buttercup. If there is any way you can get him to Krum, I can vouch for my frister, Patty58. She will be a spectatular foster mom, and will absolutely fallin love.... but in the end, Patty WILL do the right thing and gladly place your Buttercup back in your arms.
Please try to keep us posted on how you are doing
big hugs