I had some pretty bad POTS for about a month, and it recently went away when I went back to the B12 I'd been taking before it started. Before and after the bad POTS I was on sublingual 10mg hydroxyB12 tablet usually 3 times per day (every 4-5 hours starting when I wake up). During my bad POTS period, I was on 1mg hydroxyb12 sublingual drops twice a day. Can the amount of B12 I took (2mg versus 30mg) affect POTS symptoms? Or could the 30mg daily create a withdrawal affect when I went down to 2mg? Or is it just complete coincidence?