I had a 1974 Ford Galaxy 500 2-door that I parked one evening on a hill ~ 1987. Next morning, the car was Gone!
Called the cops, sat on hold... They said the car had been towed. Why? It was found blocking an intersection at the bottom of the hill....
Luckily, it didn't seem to damage anything. My guess is that it was bumped when someone parked in front of it and it somehow got knocked out of Park. (The parking brake release was some fancy "modern" thing that was intended to release the brake when shifting out of Park ...)
It learned me to turn the steering wheel appropriately when parked on a hill.
I hope you win the lottery soon so that you have a little bit more reliable transportation. :-)
Hang in there.
Cheers,
Scott.