hi though the people who get this wont shout about it but seems it quite a common thing in both sex's this should help explain it a bit more. orgasm is an complex process and involves release of numerous chemical mediators like dopamine bradykinin prostaglandins etc. these mediators can in some induce symptoms like nausea vomiting headache muscle pains etc. medications which suppress the action of these mediators will surely prevent such symptoms. medication like metoclopramide will reduce the nausea and vomiting. do hope this helps you. good luck
after my wife and i have sex i have really bad nausea to the point where i actually start vomiting. any sugjestions?