Hi everyone. I'm hoping you can help with this debilitating symptom. I started having major POTS symtoms while pregnant in 2011 (confirmed by a ttt last October). I have typical POTS symptoms while standing / walking (heart racing, nausea, lightheadedness), but also many of the same symptoms while siting. The worst are these panic attack-like symptoms - adrenaline rush, tachycardia, faintness, anxious feeling, shaking. This happens predominantly after lunch, around 3-4pm, after dinner and around 9pm. Almost like clockwork!! I take Propranolol and Klonopin 3x per day, but these "attacks" still occur. They seem to come out of nowhere and aside from the anxiety they produce, I don't feel anxious and would think the Propranolol and Klonopin would prevent panic attacks, if they were anxiety-driven. I'm so confused! For those of you that experience this, is this part of POTS? Do you get symptoms while sittig? Does anyone have this happen daily? Has anything helped you? I've cut down on carbs and sugar, which definitely seem to be triggers for me, and eat frequent small meals. Sorry for all of the questions, but these attacks are really preventing me from doing so much