Sorry to hear what happened, but glad you are (mostly) okay.
As far as I can remember, it takes about an hour or two until the gravel rash really starts burning like hell and the bruises really start hurting the next day.
Leathers are a good thing, but only if you keep all zippers closed, my left forearm still shows some signs of proof.
Aggravating incident, but remember, it could also have come much worse. Just imagine a car somewhere nearby or hitting one of those nasty guardrail posts.
Get well soon, mate!