Check your brake fluid reservoir, if it's not full or wherever it was last then you probably busted a hose or it's leaking somewhere.

Is it possible that the ABS failed/malfunctioned? I know the ABS's job is to release small amounts of brake fluid when the wheels are about to lock and recycle it back through the system, so maybe it's stuffed and is constantly releasing fluid...? I know it's a long shot because ABS is supposed to be a "failsafe" unit, but I guess every machine/device wears out eventually...

I'm sorry to hear about your accident, thats terrible luck.. Is it fixable?