ASSERTIVE and decisive about what they want to do! Geesh!
From my own other diverse experiences...all I can say is GET THIS STUFF outta me!...... That's the way I approached it. And I am glad it was done.
Get it over with, then go on to the next part of the 'issue' should there really be one.

As long as the docs and surgeons and anathesiologists know you are an 'at-risk/sensitive' person, things should go and be done super!?!

I know I approached my own surgeries last year with a similar angst as you are feeling now, but, in my case it was a bit more straightforward? I think of it this way, [biopsies and all?] I did the best I could to do the best I could...Sounds redundant, but really it's not.

Special tender 's of the kind that give you a bit of courage as well as some comfy re-assurance. I WILL be her for you and any concerns you may have should you have them. I believe all here will be pulling for you in every way one can 'electronically'. - Super special thoughts! - j