i've had the same thing. except the accident did happen.

Driving along I96, on the radio comes "spirit in the sky"
(long story why this song does it)
and i go to wipe my eyes and wham in the back of another car.
no matter what, i dont wish emotional accidents on anyone.

Change the song, and keep note of what song made you feel like that. when you make it home. lock yourself up and listen to it over and over.
it worked for me, now i can listen to the song and not break down, but it still brings that feeling to the back of your throat