I read an article that said a lack of magnesium will make you extrememly fatigued. And that a lack of it can cause jaw pain. Does anyone know if there is any truth to this? I have started excercising very recently and I am in a lot of jaw pain and so tired I could sleep 24/7. I started taking a liquid multi vitamin that tastes horrid BTW, and also the magnesium. I'm desperate, something is worng but I don't know what. Eating good and plenty of water. Please help.