check blood pressure...this happens to me when it drops
redbird

I think I hate dizziness worse than nausea!  Sorry you're feeling bad.

Run this one by your doctor.  There are too many possible causes, including fluid in your ear(s), ear infection, and more, that should be ruled out before you attribute it to MC problems or POTS, although one of those could be responsible.  It's allergy season, and that could be a factor.

Robin,

So glad the water made a difference so fast!  I rarely feel thirsty and have to remind myself to drink often, because dehydration can cause my mast cells to degranulate.  Fatigue is the big symptom of even a little dehydration for me, but I can get a rapid heartbeat, too.

Sorry you're in a rough "place."  

Every once and awhile, even though I am on my regular meds, I will get periods where I get dizzy all of a sudden.  I think in my case, it is a little bit of break-through.  I also have a bit of a vestibular problem as well.