Rusty after they do your blood work and determine if your kidney's can handle the dye have some faith that they will do the right thing. I have had the dye as my kidney's were fine. It does give you a hot/flush feeling.
Are you having a CAT scan or a PET/CT scan? These names are so similar that I can’t keep them straight. I have had a PET/CT scan and can talk about that experience.