"Up on sitting up or standing up from a lying or sitting position my heart rate suddenly beats slow for a few beats and then gradually speeds up. I don't get dizzy or feel like I am about to black out. In some definitions I really think i..."
"After sitting or lying for too long when I stand up my heart rate slows, it pounds and then races for a few seconds. It feels weird around my chest and my hands get cold. I DO NOT get dizzy or feel like I am about to black out. Somedays ..."
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