You're right about the medieval torture! It's seems bizarrely to be from another time, this mask...but it sounds like you're doing alright with yours now. It seems the fitting is probably the worst of all the sessions you have to endure...so I feel hopeful that the treatments themselves will be comparatively bearable. I will be taking my own music in, for sure. And I do hope for some eye holes.

Good luck with the rest of your treatments! May those photons and gamma rays go straight to where they're needed!