anyone else experiencing inappropriate sinus tach. also palpitations with pvcs and pacs. nothing shows up on a regular ekg. it is not atrial fib but random tachycardia without trigger. also normal on cardiac imaging including echo and angiogram. the tachycardia is random and often occurs in my sleep or at rest. often triggered by eating. along with this comes exercise intolerance. lung studies are also normal. i have been on a multitude of meds without relief. so frustrating. the palpitations are very annoying.