I remember having that feeling, back when I was in my 20s. Plenty of orgasms, loved my husband, but there was this melancholy thing that would hit after sex and I couldn’t make sense of it.
Interesting...62 posts until we learn of a real case. Must have been awful. Sounds like you outgrew it?
Arousal is a form of stress, and stress is physically harmful to the organism. The body has some sort of mechanism to bring itself back down.