I've never had surgery either and I am a big giant chicken but I do have to go to the dentist every three months for a deep cleaning(I know so not even comparable lol)... I shake like a leaf literally every time while I'm waiting for the procedure and then I get the gas and am either in lala land or knocked out and it's never as bad as I imagine...
My point is it'll be scary while you're waiting but then you'll be under and it'll be all over. Granted there will probably be some pain afterwards but hey maybe you'll get some happy drugs.
But I hope it's nothing serious!