Extremely Hot And Flushed Face, Red, Swollen Arm, Neck And Shoulders Followed By Goose Bumps And Chills After Taking Cortisone Injection In Left Shoulder. Suggestions?

I had a cortisone injection in my left shoulder yesterday afternoon. All night I was extremely hot and my face was flushed. This morning I got up & the area on my left shoulder is red, my entire left arm is swollen, very red like a severe sunburn, now the base of my neck & down the middle of my back is all red & hot. I've got a headache. I phoned the dr. that did the injection (specialist in the Mayfair Radiology dept) he want's me to come to the hospital tomorrow afternoon to look at, but didn't know about my neck & down the middle of my back now being red & hot, like a sever sunburn. a few times I've had goose bumps & chills for just a few minutes. I am on fire with this. Could please give a suggestion as to what is going on etc. and what I should do about it.