Thanks for the responses. I've been thinking on it all week.
I guess I agree that the memory alone is not a strong enough reason to move, and I'm very encouraged to hear that it'll probably just be a road again to me some day. Today is not that day, someone honked at me at the same spot where the wreck occurred and I had a bad reaction whereas I normally shrug that kind of thing off.
The fact that the road is dangerous is definitely more of a consideration. There are a few things we dislike about the house (poor internet options, expensive propane heating), and I think this kind of tips the balance against all the thing we like about the house. I meant he doesn't feel the same way about the memories of the road, because (as he said) he didn't see it happen the way I did. I wouldn't call it marital strife...we have talked about it more extensively recently.
I did at one point start to look into talking to someone but I quickly got overwhelmed by the random names. I'd really have to ask someone I know to recommend someone, and, I don't know, I just don't feel like doing that yet. I would if I thought it was a problem, and I'm watchful all the time to see if it is. What makes me think it isn't is that I'm improving. For example driving around town was noticeably better after the vacation than before.
2009 Trek 7.2FX WSD, brooks Champion Flyer S, commuter bike