My brother has had for years a certain health problem which has never been diagnosed. He has a pain in his head and a feeling down his spine and it feels like his life is draining and a kind of tingling. It comes and goes and he just has to sit down. We have rushed him to hospital looking very pale with sweat dripping off his nose in a panic attack. But when the test him there is nothing they can find. He is wondering if its because when he was young he took poppers over a number of years that it has affected his nervous system. What would the affects be if so...?