Fainting

This morning I got up, went outside to say goodbye to my hubby who was leaving for a week for work, had a wave of dizzy and next thing I knew I was lying between two cars on driveway! I fainted!!!  I never ever faint! 

Im getting in 1000mg B12 and 2 multi vitamins a day, drinking 5-6 glasses water, 80 protein, eating all protein and very little carbs if at all. 

Any suggestions?