Thank you everyone for the info and support! I think you are right, and I'd imagine that my blood pressure and pulse would also be really abnormal, not to mention other stress hormones. I think based on this and what other folks have said, it probably isn't worth it at this point since that is so much of what they're testing for. If, as he said, it is just "preferable" and he can get enough of a picture without the blood draws, then I can start there. And maybe if that is needed at a later date I can work harder to desensitize myself over time to be able to tolerate another round with IV or wh