to have random episodes where I can be sitting still not doing anything and my heart will start racing to 150+ bpm.. I am a 22 yr old female.. I had an episode a couple months ago where I was just walking through my friends office and all of a sudden I felt weird, and my vision started going black, and then I felt one big beat and then my heart started racing so fast I couldnt count it, it felt like there was a vibrator under my chest bone, my friend could even feel it. they did blood work to check my thyroid and everything looked normal. when I got to the ER after the vibrating episode my heart rate had gone back to 126 and they put me in a wheel chair and immediately took me back... the DR said theres no way it could be anything serious and sent me home that has happened once more since then... but normally the rapid heart rate is every so often.... for the past 3 weeks its been every day and when it happens its never slower than 130bpm... I have noticed my hair is now falling out by the handful I am dizzy alot, and its noticable when I feel this way, my mom even says I look like hell. but it will happen when I am just sitting there not doing anything, no stress or anxiety I was in the car yesterday and it was 136, I walked into walmart and it was 148 by the time I got in the door, I sat down for about 20 mins then walked over and took my blood pressure and it was 127/78 and 110 bpm, which is a higher than normal systolic for me...I eat a balanced diet and I am on no medications,