Thought I had POTS: turns out it was SA node dysfunction!

I was diagnosed with OI in 2006 (the neurally mediated hypotension type), and in the last few years I thought that I had also developed POTS...but, I was wrong. Rather, the heart's SA node was misbehaving and creating what is informally called sick sinus syndrome where you move from bradycardia to tachycardia, experience lightheadedness, etc. I confused the tachycardia with POTS. I am just posting this because there is a slight chance that others who assume they have POTS might have...

Thought I had POTS: turns out it was SA node dysfunction!