My heart beat is usually from higher than 90 and ranging to 120 in resting state whereas my ECG and Echo were normal... My heart Beat has remained high since childhood and I was born pre-maturely at the end of 8th month. Sometimes when I get up after watching a Movie on my laptop while in a horizontal position(lying), i get weird feeling like my heart has gone up to my mouth, it beats so fast, two years back while i was sleeping i had a swear unexplained headache late at night and it was so intense that i was shouting in pain... But all test were okay... most of the time when i focus on something very hard while sitting in a bent position or lying and than i stand my head starts to rotate and it is hard for me to remain upright, one more thing i cannot focus on practically anything no books or laptop or mobile or car LCD while in a moving car/bus/ or anything that is moving and i am sitting in it, I get feeling of swear vomiting and like i start breathing very heavily and my head starts to feel weird and my heart beat starts to go very up...