this sounds like some of the symptoms i experience before i have an ibs (irritable bowel syndrome) attack; my ability to regulate my body temp. is poor i cramp i feel nauseous or faint and sometimes have loose or painful bowel movements. if you don't have a history of ibs perhaps this is your body's response to anal penetration--i know i feel a bit logy the few times after i've done it.
after anal sex i experienced extreme nausea cold sweats and lethargy - no other symptoms. was this related and why?