If it helps, i'd trained for six months then damaged my knee ligaments during my first race. This made it impossible to run and even swimming was difficult due to the nature of the injury.
The important thing was that, although I was feeling like the previous months had been for nothing, I DIDN'T rush back. This paid dividends and just six weeks after returning to full training I completed the Great North Run.
Think positively about what you will achieve by allowing the injury to recover completely and don't dwell on the fact that, for now, you've been stopped in your tracks. Good luck.
