extreme pain after sex and mouth tastes like blood

Michelle
Ok so today me and my boyfriend had sex and once he put me in this one position (I was on the edge of the bed and my legs were up against his chest) it suddenly started feeling really deep and I started to feel sick in my lower abdomen. After we were done I had an extreme cramping feeling in my abdomen and I felt insanely sick. It was so bad I could hardly think straight. I felt like I had to throw up but I couldn't. I also really felt like I wanted to pee (which I always do after sec because of UTIs) but I couldn't do that either. Then while I felt like I was dying in the bathroom unable to do anything I started feeling like a lot of saliva accumulating in my mouth and it tasted like blood. I kept spitting it out and here was no blood but it just tasted like metal really bad. This lasted for about 15 minutes then it went away and I felt fine. What could this be? I had a similar feeling another time we did that position but this is crazy I almost was going to tell him to take me to urgent care or the emergency room. Has engone else felt this?