Not all tours are "sunshine and roses" as you just found out. You probably did the right thing by discontinuing, rather than risking further damage to your ankle. I made that mistake after slipping in loose gravel while pushing my loaded bike over to a rest area, badly tearing shin tissues. Thought I could ride through the pain, but after going another fifty miles, I couldn't walk at all on the damaged leg. I had to abandon the rest of the tour, and was laid up for 2 weeks. Start planning another tour, the next one will be great! P.S.---I always carry a good anti-inflammatory such as "extra strength ibuprofen" for the smaller strains.