on the h22 series engines the weak area for high rpm is in the head not the block.
supposedly the stock h22a crank is good for up to 8500 rpm's
the retainers/springs/etc. are in danger in this case
in my lude i can do 69 mph at redline in 2nd gear, so u couldnt have over reved by too much, plus it was a DS so you were slowing down as soon as you released the clutch (engine braking)
are u getting an engine light?
if not than u may have popped a retainer or spring
either way if no light, then its mechanical and the ecu is unaware of the problem, keep it out of VTEC in any case, until you figure out what happened.
easiest thing to do is pop the valve cover and examine the valvetrain...unless your not mechanically motivated
hey dont feel bad, when i was 16 i downshifted my sisters 90si the same way, but nothing broke luckily, thats back when i was new at the whole "stick" thing.
~boomer