I've been with my Mom when she was doing the breathing test and I really think you will make it thru that one okay.
I've done the MRI thing maybe a half a dozen times. Like you, I didn't know how much it annoyed me until I did it the first time. Now I sing songs in my head, replay some memory from beginning to end, work on counting my breaths (unless they are saying "hold it") and just about anything I can think of to forget what is going on in general. The dye is okay as long as you have good veins and they can get the iv in. I have sucky small, rolling veins and it makes everything a big damn ordeal.
So, the best of luck to you. I am one of the people that do.
( I've suffered thru 5 years without them...you might as well, too. 8) )