I sing in a band and sometimes if I scream really hard I get a erection followed by some dizziness. It only happens if I scream really hard. Does anyone know what this is?

Well, it's kinda complicated to explain. Whenever you scream really hard, your voicebox is taking that pressure. You know when you get calluces on your hands? Well, apparently that CAN HAPPEN to your voicebox too, so be careful! That stomach pain and dizziness? Well that's your body telling you you've reached your limit. Screaming interrupts the normal breathing patterns. When the body is starved of oxygen, particularly the brain, dizziness is often the results. The pain in the stomach can be caused by the same lack of oxygen.