How serious is it that I'm doing week 4 and have developed a dead leg/foot midway through. My foot actually scraped the ground at one point due to it feeling numb. I guess my legs were just carrying it along. It was fine as soon as I had cooled down again??? Any ideas or self help suggestions would be appreciated. Also can I request to see a proffessional such as a physio through gp for support or are they private?