Cripes. I dunno. I wouldn't go, but that's just me...
I'd say go with hit by a ball.
Or, could you wear one of those surgical mask things and say that you're scared of catching the flu?
Or, a big bandana round your lower face and say you're on your way to a bandit party?
Or, cry most of the session and out your hands over your face, - just pretend if you're not feeling it.
Also, try an ice cube, prick it with a pin, tea tree oil, and steaming! Good luck!