Hi there - you're going to be ok....
I've had 2 hida scans done way back in '96/97 prior to GB removal. I won't go into great detail here because I've posted my GB story SO many times before that you can find it somewhere in the archives I'm sure.
Anyway, the hida scan may make you nauseous. It did me, and I was already very sick from my diseased GB. I didn't vomit, just felt nauseated. The worst part was when the CCK was injected into the IV, which set off a typical gall bladder "attack" - the pain was INTENSE!!!!
Anyway, that's how my surgeon knew it was my gall bladder since my hida scan results were considered "normal". Once the surgeon opened me up, he said my GB was severely inflamed and covered in scar tissue. Horror stories or not (and I suffer from bile salt diarrhea after GB removal) I would have the operation again in a heartbeat. The pain, pressure, nausea, etc. was gone after my GB was out.
Good luck and keep us posted,
Katie G