I know there is an issue because a few months ago I blacked out while in the kitchen, nearly putting my hand on the stove. The strange thing is that i remained concious, stumbling around, i couldn't see but my vision returned after about a minute. More recently I noticed my hands shaking, and my arms feel like they are falling asleep,also my heart beats rapidly without doing any type of exercise. I have blacked out before, and i worry about it a lot now since when i stand up i feel extremely dizzy, especially after I wake up.Sometimes there is pain near my wrist.I took a multi-vitamin daily thinking that maybe i was lacking something, but i still have the rapid heart beat, shaking, and pain. What do you think these symptoms are?