I had the same issues. It,s sometimes refered to as the million dollar work up disease because thats how many test they will run to tell you there is nothing wrong with you but stress. I found it was the inner ear with sinus draining issues. I am able to control it by taking 1/2 a claradin d pill as soon as I notice any symtom. It's important to drink plenty of water daily.I also will use a set of ear planes on and off anytime i feel off balance. I trim the end off so they are less noticable when you wear them. they really seem to manage the dizzy or out of balance feelongs. Lastly there are head exercises you can do to drastically improve your overall situation with balance ,inner ear and sinus.
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Welcome to our Chiari community! : ) "selma"