I've been getting hot flashes, nausea, consistent pooping.

I've had sex three days in a row with my boyfriend. Never used a condom. But he pulls out before he cums. I've been getting hot flashes, nausea, consistent pooping. I've been getting some cramp like pains between the end of my stomach and beginning of crouch area. I've had sharp pains on the left and right lower back. When i put pressure on my stomach i feel sick. I doubt its possible to feel all this only three days of intercourse. But what could it be?