What causes lower abdominal pain 5 minutes after sex. Chronic pain and throwing up? Hot flashes. Pain last for about 30min.?

Possible cyst. It is possible that you have some type of problem with your ovaries, such as a cyst, or maybe even endometriosis. You need to be evaluated by your gynecologist as soon as possible.
Multiple causes. The most likely cause is spasms of the pelvic floor muscles. During orgasm this muscles will have rithmic pleasurable contractions. In patients with vulvodynia, ic or endometriosis these muscle could become hyperexcitable and makes them cramp like a charlyhorse. This pain may last for minutes, hrs or days.