MG
I had major surgery a few years ago and was afraid of a major meltdown. My therapist contacted the hospital where I was having the surgery and asked for a psych resident to monitor me before and after the surgery. When I first woke up, I started to panic but the doctor kindly asked if I was ok and what he could do for me. They also arranged for a private room on a private floor of the hospital (that I later found out my t arranged and had paid for) It all went much better than I hoped as other surgeries scared all inside. I attempted to tell the doctors and nurses in previous surgeries and that didn't work out well as they thought it was a big joke.
Good luck I hope it goes well for you.