That was an extreme shock for you, my blood pressure would probably be high too.
Two drops of blood wouldn’t worry me. Since the shock is pretty deep, of course you are scared and stressed, this has an effect, probably causing your cramps.
But the more you get into it, the worse it gets, I can speak from experience here when I was stressed, I also had cramps.
Thank god it wasn’t a much worse accident. So try to breathe and relax try to let go. If your symptoms get worse, please go to the hospital.
I wish you all the best.