feeling sick after sex, also unbearable pain down one side of me inside my vagina whilst having sex.

Hi
I have been having unbearable sharp pain down one side of my vagina inside whilst having sex for about the last month now, I thought it could be a cut or a friction burn maybe, but it's been going on for ages now, and it means I have to stop having sex cause it hurts too much. In the last week I have started feeling sick after sex also.
I was on the pill until last month, and my boyfriend and I have unprotected sex, but he withdraws.
I am about 7 stone, maybe a bit less.
We are both 19 yrs old.

Please give me some advice as I am at a loss of what to do.

Thankyou
Jessica

I would see a gynecologist if I were you and had this checked. You could be having hormonal problems, problems with cysts on ovaries, problems with endometriosis, or something else that could be causing pain during sex.