hi, skully,
i lost a toenail on my right big toe last year; it was from a pair of shoes that fit in the morning but, as the day went by, would feel too small. the nail became discolored and hard as a new one started growing underneath. i covered it with a fresh band-aid every day so that the old nail would not fall off while the new one pushed it out. (the skin underneath your toenails is very sensitive as i'm sure you are aware. keep the old nail on as long as possible to protect this skin.) it took a couple of months but the new nail has grown in and the remains of the old one have been cut off. good luck with the broken toe - that's probably more serious.