If an injury is threatening your health as you approach the Marathon, note that you can cancel your spot and be guaranteed entry for next year s race. Consult the Marathon Instruction brochure for cancellation deadlines. The Aftermarathon You will need about a month to recover and rebuild after your marathon. For the first few days it may be best to not run. Don't pound away on muscles that need time to repair.
Swimming is particularly therapeutic.
It may be a good choice to run every other day, or to alternate running and walking for your workout. By the fourth or fifth week you may be ready to resume normal mileage. For example, this may be 40 miles a week compared to 50 miles when at peak marathon training. Forget about how fast you run for awhile. Run easy, according to how you feel.