Upon standing from a sitting position I often get very dizzy, experience tunnel vision or partial vision and my legs feel abnormally heavy. I feel like I am about to faint. most time is passes if I am able to lean against something or sit for a few moments. It is scary because I can feel it coming on and when fully into it, my brain doesn t seem to be fully functional. Today this happened and I was suddenly moving a few steps forward andal few steps back like a totally drunk person. I could feel myself moving eratically, but really couldn t see my way to a wall. People saw I was having an episode and came to my aid. I take a blood pressure pill once a day hydrochlorizide hctz