[Espi]

This afternoon, some 2-3 hrs after working out, I was suddenly unable to extend my left arm w/o pain.
Raising it with the arm bent is no problem, but even letting it hang down and let gravity do its' work hurts.

I've done several upper body exercises, among which 'jerky' push presses , 1-arm lat pull downs & db swings (12kg).
The jerky push presses are relatively new for me and I may have exaggarated things for a bit by doing static holds overhead at the end of some sets and esp the final (lighter) set.
But why, if that's the culprit would it only have started hurting so much 2-3 hours after the workout?

What's more.. how long does it takes before this pain subsides? Right now I'm even afraid to lift the lightest object for fear of dropping it and I'm scared of driving..