I wear the earplugs, say yes to the blanket, and keep my eyes closed as soon as I lie down.
I meditate also...count my breaths in groups of 10 (I always forget what number I'm at so I have to start over, which distracts me from the tube).
I also ask the tech NOT to tell me how many minutes each batch will take...it stresses me out. I get through it with no narcotics, and am relieved when I feel the gurney sliding out of the tube.
Good luck!