Hi Luna,
I am not usually claustrophobic but discovered I was when having my MRI. I made a mistake after they put me in the "tunnel" and opened my eyes: I had to get out of there really fast. After calming down and walking to slow my breathing and getting a grip on myself, I realised I was so ill I had to have the MRI at any cost.
My MRI team was so supportive and understanding of my fear. They suggested I try it with a blindfold: it worked wonders for me. I was able to open my eyes if I wanted too but did not get that terrifying "panic" feeling during the entire procedure.
Becky