It 's called orthostatic hypotension. If you haven't stopped them, it could be caused by the drugs. For many people it 's natural. Me for example. When I 'm sitting for more than 20 minutes and stand up quickly, I almost get blind because of low blood pressure. Your last solutin should be salt. Try to hydrate yourself as much as you can during the day.
Penna, I've received six likes but I can't post on the main forums yet so I assume I am still being judged on the previous Newbie system. I can't find anywhere how this system works though, could you tell me?