Hey Wobbly, It sounds like you're getting your legs back - good fer you!!! I kinow exactly what you mean - every day before my commute I say to myself "I hope I make it today!" and when I arrive and find that I'm all in one piece, it's "whew, i made it". I think it is a function of knowing just how vulnerable one is, and how long it takes to heal, and your experience on the road. Any sensible person should have such thoughts - and still, I rationalize that if something bad has to happen, I'd surely rather be doing something I love if/when it does... Don't let your cautions become aversions.
My arthritic knee had just about crippled my walking until I got my quads back in shape on the bike. Now I count my lucky days.