When I orgasm, I get wetter. The only time I start to dry up is if we've had sex for a long time and it starts to get painful. I don't know why it's happening to you.
I think its all in your head. Just let everything happen naturally.
It is normal. Your vagina swells during sex and orgasim and takes time to come down. It's harder to penetrate when you're swollen! BUT lube does help!! But you are perfectly normal.