Upon sexual climax I immediately felt weak and as though something had popped in my head. I stood up, walked for a bit, and then felt very dizzy and fell -- the world seemed to be moving in slow motion for a bit, and I couldn t think straight. This condition resolved within a minute or two, but I felt very cold and had the chills. It s been about half an hour, and I feel okay aside from a bit of lingering chills. Is this something to worry about? I didn t have any numbness -- just (1) the sensation of something weird in my head on climax; (2) ensuing dizzyness, weakness, and a lightheadedness that was severe enough to make me fall and stumble around for a minute or so; and (3) the chills, which are only now beginning to subside.