I'm 69years old. Have suffered from  this dizziness for 15 or so years Use to run 5miles a day. Can't do any more. Hard to even use treadmill for fear of fainting or falling off the treadmill. Have had every test imaginable found nothing. Can't drive on long trips for fear of running of road or into someone. I can't even swallow any type of pill -over counter or medicine. As soon as it hits my stomach ' 15 minutes later I'm lightheadedness and dizzy.I do have acid reflux but no connection. You feel like a prisoner in your own body. It's hard to concentrate-your head feels fuzzy and heavy all the time.Hope There's Help Out There