What does this mean?
most mornings, I get up, go downstairs, and sit down in a chair to wake up. about 30 minutes later, I go and get breakfast, but as I get up I feel lightheaded, my vision goes Gray, and I get a high ringing in my ears. I get this a lot, so I'm used to it, so I just hold on to say a counter, and let it pass, takes about a minute and the gray slowly goes away. what does this mean? and how can I stop it?