Background: I haven't worn shoes other than Skinners for a full year. I nearly always run fully barefoot, about 40-50km a week. I also walk (barefoot/skinners) and dance (in socks) a lot. First noticed slight soreness in my fifth metatarsal area when running about a week and a half ago. The only thing I'd been doing differently to usual was running more hills than usual. Like an idiot, I kept running on it for a couple of days, then had to spend three days resting because it hurt to walk. Tried running on it again when walking felt ok, which was only mildly achey, but the next morning I woke up with pain on walking again. At no point has pressing on the foot caused any pain at all. There was very slight swelling but no bruising. After complete rest for three days, there is now a very mild pain when walking normally (if I consciously keep my weight on the inside of my foot it feels fine). I'm signed up for a HM in three weeks. Is there any chance at all I might be able to run it? What should be my approach for exercising between now and then? Is it fine to increase weightbearing activity as long as I stop at the first feeling of pain?