Have you guys ever heard of it? It's extremely race but probably because it's under reported and guys just don't know they have it. Wikipedia definition says Postorgasmic illness syndrome (POIS) is a syndrome in which men have chronic physical and cognitive symptoms immediately following ejaculation in the absence of a local genital reaction. The symptoms last for up to a week. The cause and prevalence are unknown; it is considered a rare disease.. some of the symptoms.... The distinguishing characteristics of POIS are: the rapid onset of symptoms after ejaculation; the absence of any local genital reaction; and the presence of an overwhelming systemic reaction. POIS symptoms, which are called a "POIS attack", can include some combination of the following: cognitive dysfunction, aphasia, severe muscle pain throughout the body, severe fatigue, weakness, and flu-like or allergy-like symptoms, such as sneezing, itchy eyes, and nasal irritation.Additional symptoms include headache, dizziness, lightheadedness, sensory and motor problems, intense discomfort, irritability, anxiety, gastrointestinaldisturbances, craving for relief, susceptibility to nervous system stresses (e.g. common cold), depressed mood, and difficulty communicating, remembering words, reading and retaining information, concentrating, and socializing.Affected individuals may also experience intense warmth or cold. The symptoms begin shortly after or within a half hour of ejaculation. The symptoms can last for several days, sometimes up to a week.