Hi Kath!
I never got nauseas when I had blocks done, but everyone's different. Besides the steroid, they probably put in a numbing med, like lidocaine which is the med that is supposed to help quiet the sympathetic nerves down. I don't know what else they put in there. If they give you sedation, maybe the med that they use for that is making you nauseas. I know that some people get nauseas when the pain is really bad. Maybe that's it?? I see you're from MA. Maybe it's the heat?? Just some ideas. I have no idea about the rash at all. Maybe someone else does. Bye.
Sharon