My story is much like yours. I am 62 years old but had fainting episodes as young as 10 years old. Then in my twenties I feel like I went into remission for about 15 years. Then my symptoms of fatigue, insomnia, easily overstimulated, IBS, dizziness, tachy and ER visits that were much like a TIA but involved my whole body. I couldn't talk, bear weight, had not an ounce of strength, dizzy, nausea and vomiting and sometimes very low BS. It wasn't until 4 years ago after a hospitalization that a Nephrologist of all things, thought I might have POTS. He referred me to Johns Hopkins for the TTT. I have both POTS and NMH (same as NCS). I read Dr. Grubb's book and he states that in older persons the episodes of NMH can be very similar to a TIA. I hope you can get some answers. Having NMH is not "just an inconvenience"but is Quality of Life altering for me.