I have an AVM in my brain stem. Much like an aneurysm. It is a mass of blood vessels where the arteries and veins did not differentiate during fetal development and they are veins under arterial pressure. When I exercise (i.e. get heart rate over 100) the AVM leaks serum and causes SEVERE headache and vomiting (docs say it is the clinical opposite of a migraine, but with same symptoms). I've had brain surgery 13 times for insertion and revision of VP shunt to allow CSF to drain out of head. AVM caused normal pressure hydrocephalus. All this started showing symptoms at age 27 (not under 2 or over 72 as would be expected).
at 4:41 AM on Jul. 7, 2010