I've made the call of shame owing to mechanicals from which I could not extract myself. That's a different psychology, but very embarrassing from a different perspective.

As to the lack of motivation following your trauma, I think you've already received some good advice. If you have lost a lot of fitness and the idea of even approaching your "regular" ride gives you bad feelings, then find some other way to get out there- you know you'll enjoy it once you get yourself out the door. Cycling with a friend - particularly one who is generally less ambitious than your normal self - is a great idea.

Also, think about leaving the cyclometer off the handlebars. If you have no idea how far you've gone or what your average speed is, you can just enjoy the ride. That's the most important thing.