My normal heart rate is 60bpm when lying, can go up to 110 when sitting up but normally in the 90's however when I stand up it jumps to in the 150's, sometimes 170's then obviously higher once I start walking etc.
It's long been dismissed as normal because my average heart rate over a 24 hour period is normal - obviously because I'm lying down sleeping and sitting for over 12 hours per 24 hours.
Does anyone else live like this? I honestly can't do much because I'm so dizzy.