MRI's don't bother me....so I'm probably not the best one to give advice.....but I understand the apprehension of something that you dread.
I've never been offered eye masks but I do keep my eyes closed throughout the procedure. There's something about being able to "see" of I choose to.....and I do open my eyes momentarily from time to time....just to make sure I can! Since you have to remain so still the eye mask would probably make me anxious because I couldn't remove it whenever I wanted to.
I've been offered music but not sire I'd be able to hear it over the banging and clanging of the machine. I tend to listen to the beat of the machine and it almost lulls me to sleep. I get very relaxed and drowsy.
Some folks take a valium or xanax before going in. Is that an option for you? I hope it all goes well for you and goes quickly. And that it comes back clear.