I am running in the London Marathon. On Sunday I did 19 miles but my big toe was very sore for the last 8 miles. It is badly bruised (especially under the toe nail) and very very sore. I have since been wearing sandals so it doesn't rub, using Voltarol gel on it and taking painkillers (it keeps me awake at night). I tried to run this evening (after padding my toe) but stopped after 100 yards as it was too painful to run. The shoes I ran in are my usual running shoes that I bought over 6 weeks ago and have been fine. Any advice on what to do please? Thanks.