If you havent already, i'd recommmend seeing a professional for the best advice. I'm in the same boat as you with regards to the injury during training and its knocked my confidence big time.
I think im suffering a bit from Plantar Fasciitis in my right foot after compensating for a previous knee injury on my left. I saw an Osteopath at the weekend and told me given my current level of fitness, if I rest it, and do the stretches necessary to aid the healing and muscle balance I should be ok.