((((((((Yoda)))))))))))
I've had the "closed" MRIs before. TOTALLY NOT FUN! And I don't even suffer from claustrophobia or from any abuse that could cause negative feelings...
MRIs are loud, scary, and bright/dark enough as is - without dealing with triggers and anxiety to boot! Actually I don't much like CAT scans either... but at least those aren't nearly as bad.
Call him. Seriously. Tell him that crazy Christina on the other side of a computer sympathizes with you in your discomfort to submit to a closed-MRI!

I'm glad you made it through it though!