I have had some of these symptoms for years but was never that serious, but these days it has been extreme and really scary to experience, some days ago i had a really bad experience, I stood up and all my vision went black and my body started shaking I lost my balance and I almost fell, my body was shaking like crazy I thought I will die and the vision black out lasted more than 20 secs and it was so confusing and scary. I went to a physician today and I think I didn't told him my problems nicely and he said I just have depression but I feel like it's more than that. these are all the Main symptoms : Orthostatic hypotension, vertigo, dizziness, loss of balance, chest pain, cough, upper back pain, nausea, seizure, blurry vision, lightheadedness, shortness of breathe, confusion , vision blur, black spots floating around the eye, loss of appetite. I am also a heavy smoker.