I found out that that pain in the left foot, it totally IS nerve pain! It's never going to go away! Isn't that fucking lovely. It may go away, that is, or maybe not, or maybe cortisone, or maybe surgery, or whatever. So this might mean I can't hike anymore without huge pain, or any of the other many things I enjoy doing on my feet.
Official diagnosis (for now): "Morton's Neuroma"