I’ve been running barefoot for months now and really enjoying it. Last week I tried to do some speed trials barefoot and by the time I finished my last 30 second drill I have pain in the upper pads of my left foot. It’s been about 6 days and I can finally walk on it without shoes but not far. Nothings broken and I can place weight on the foot it’s when I step off that it hurts. Any ideas as to what I might have done?