I had a similar happening when I had my cardiac stress test a few years ago. Of course, being the cruddy hospital I go to no one was worried about the dye.
Anyhow, everything was fine. It was just "how I am."
I know its easy for me to say not to worry, and boy, do I understand wanting all of this to just go away. But maybe, just maybe, we are blessed in a special way. The Good Lord picked us to carry this burden because not only did He know we were capable of it, but also so we could show others the way.
I will be thinking of you.