I am a vegetarian for a good 5 years now, and lately i have been getting really dizzy, and i don't know why. the simplest moves and i am so dizzy i have to catch myslef, and then it goes away after a few seconds. am i low in something? i take a multivitamin. I used to take a lot more vitamins, and i have been eating better to see if it goes away, but it won't. what should i do?