Thankfully, I can always ask my in-laws for expert medical advice and their opinion/unofficial diagnosis is just general inflammation of the muscles and tendons from running 26.2 miles downhill on a cambered road. I probably have a spot of tendonitis and irritation of the peroneal tendons. It seems to make sense because I only feel pain now when my foot is twisted and I am stretching the outside of my foot/ankle. The root cause of this injury is probably a combination of tight calf muscles and weakness caused by an ankle turn on a trail run a few months ago. It seems to be getting better each day so hopefully I will be hitting the trails and roads again soon.
The most disappointing aspect of my prolonged layoff after Napa is having to pull out of a treadmill 100K relay race that takes place tomorrow. I was on a very strong team that probably could have pulled out the win and gotten a $10,000 prize. However I knew by Tuesday that there was no way I could run 20K strongly on Friday and it would be better to look for a replacement rather than wait to see if I could start on Friday. So I gave up my spot and thankfully found a great and enthusiastic substitute so that at least the rest of my team could still compete. I feel bad for letting down my teammates, plus the event sounded quite fun and interesting but I decided if I couldn't run one mile without discomfort there's no way I should do the race.
So peroneal tendons, get better soon. I've got many more goals to accomplish and I can't do it without you!