Did anybody hear of sinusitis as a withdrawal symptom of over masturbation?

That's silly: There's no withdrawal syndrome from "over-masturbation" other than being horny and unfocused if you try to go too long. In fact the only time it's a problem at all is if you have a preoccupation with erotica that's taking away from relationships &whatever else you need to do; ur dr can help here. However, after a very intense orgasm, many men sneeze and sniffle.