I'm no expert but swimming can play a big part in your recovery - non-impact aerobic training.
You need to stay positive. If you can't do any exercise for a couple of months, why not use the time to do some reading about running and fitness, to educate and help motivate you once you're fit again? Make some plans.
It's a tough break alright WVM, and you're obviously feeling some despair at the moment, but try to be realistic. You'll be out of circulation for a few weeks only. Imagine how you'd be feeling if your accident had left you paralysed?
It's bad, but could be a lot worse. Chin up.