You've already beat the odds - you're still alive and on the road to physical recovery, the rest is all a matter of attitude. If you haven't read it I would strongly suggest Lance armstrong's "It's not about the bike" it's about a fellow cyclist's journey back from the almost-dead.
You're a cyclist, you have that competitiveness, you're going to tap into it and you're going to come back strong from this. It's tough right now but hang in there.