Ed - You definitely need to read Coach Seiji's article on recovery. The balancing act between allowing your body to rest and recover and doing too much is one of the hardest things an athlete has to deal with. Trust what Coach Seiji is telling you and let your body heal. Use all your available energy to heal (faster than you would if you pushed things) and then come back and regain what you have lost. And have no doubts you will lose some fitness but it sounds like you are the kind of guy who has the will power and drive to gain back what you may have lost.
One thing you can do while injured is make sure your diet is spot on, get tons of sleep, and work on things like stretching and mobility. Have you tried yoga or
Foundation Training? Now would be a great time to start those activities!