I think you are wise to call your specialist. It's good to get more than one opinion when you're dealing with a serious drug like prednisone. However, you may need to act quickly, especially if the doctors have evaluated your situation to be severe enough to warrant 80mg. So don't wait too long for that specialist opinion.
A year ago, I did NOT want to go on prednisone, because I knew all about the side effects.
But, sitting on a hospital bed, with an iv in my arm and a nasal gastric tube pumping some sort of gross-ness out of my stomach... with more than one Dr. telling me it was the best thing to do; I accepted it.
I had experienced the same pain and vomiting more than once, and I managed to deal with it at home on my own for a while. So I thought "do *I* really need a drug like prednisone?"
However, it was explained to me that, even if I thought I could deal with it on my own, it was dangerous to do so, because even though I didn't acknowledge it... I was sick, and there was a potential for a bowel perforation, blood poisoning, etc.
Hope you hear from your specialist soon.