Your description is that of a cat with some type of injury as a result fall theof a fall - well, actually as a result of the sudden stop at the end of the fall.
A cat who suddenly becomebecomes clumsy after such an event is showing the effects of an injury. Even if you didn't notice any broken bones or such, it was quite a hit if fur was scrappedscraped off.
We would have taken him in as soon as the behavior began. We would figure out some way to pay the vet bill afterwards.
Take the cat to a vet.