Any anatomy lecture anyone?

I wonder what happens inside my body right after/on an orgasm. I feel useless after it, specially if my hubby is not done yet. What could possibly happen from one second that I wanted him inside me so bad, and the next that I don't even want to move. Much less keep at it in order for him to finish. I feel that my inside cannot respond to any sensation, as if something expanded and it needs its time to collapse back to normal. I do want to keep doing it but I can't! And it frustrates me, because the second before I wanted it so bad. Am I the the only crazy/bipolar here?