It is not normal, but it has been reported quite a bit, with varying causes. I have never experienced what you are describing, but I get post-orgasm headaches from time to time (not frequently) and they have been reported widely enough (I think somebody on here even pointed me to a Mayo clinic page about them) - so that goes towards "not everybody feels good after an orgasm at all times", but your description seems to show that your distress is psychological in nature, rather than physiological. It would be nice to figure out what it is, why it happens, and how to change it.