sorry the first doc didn't work out... glad you are set up with a new one though.
MRI... especially if it is a closed machine and if they do not provide headphones/earmuffs/earplugs you might want to ask for them. it is really loud. i came out with a migraine - yes i am more sensitive in that regard, but the sound level alone can be bothersome to non-migraineurs. (when my dad had one done they put muffs on him without his even asking.)
For me i think keeping still was the hardest thing, mentally. now i don't recall - i may well have popped 2.5 mg ativan before to help with that... i felt pressure knowing i "MUST" keep still.
i am anything but claustrophobic so no issue for me there, but it certainly is a small space, which bothers many people.
a little extra klonopin is not a bad idea. bring it with if you are uncertain, and plan for a lift home if you think you might take enough to make you unsafe to drive.
if you know you will want the Klonopin if the machine is the closed-in type, perhaps call the facility before you go. they won't mind. it's a natural question to have.
((( HUGS )))
~ waves ~