Tired, burned, blistered, hungry, dark, wet. I can deal with these. In fact, being out of my "comfort" zone is a large part of why I hike.
But unlike Aaron S., cold is the one thing I can't deal with. Several times I've found myself heading down that dark hole and each time I tell myself to carry more warmth. So this season I've armed myself with a 14oz down MyoQuilt and a 12oz down jacket (thruhiker).
And if I find myself on the SHR with Aaron and I'm chilling, I'm going to borrow his windshirt 'cause I know he can take it.