Lisa,
I really feel for you, and am praying for you. How hard it must be, especially since you have children. I am scheduled to get tests TOMORROW finally, for adrenal insufficiency. I was supposed to get them last week, but everything with the doctors is taking longer than expected. What scares me about your story is that my problems actually started with a supposed balance/inner ear disorder, but after many doctors and the top neurologist at Yale-New Haven Hospital in Connecticut, a cause for my severe dizziness and vertigo for nine months straight was never found. After the "inner ear disorder" and the massive antibiotics they gave me "in case it was a bacterial infection", I've been sick, but with symptoms resembling adrenal problems instead of dizziness. Maybe I should mention to my doctors the possibility of POTS, even though you said that it's rather rare. Thank you for sharing your story, and I wish you better health!
~Katalina