Today, when I was in the store, I had the classic ME, tipping over thing, where you sort of lose your balance or almost walk drunk. I really think it's related to the POTS, lack of blood flow to that part of the brain. I have been less lightheaded lately, but it's because I cut out the garlic and nitrates in my diet. I really notice a big difference with that. Onions, too. I found that onions make my cognitive symptoms alot worse for some reason. So cutting all that out has helped.