For the past 2 months I have been experiencing extreme fatigue and nausea - sometimes being sick, other times just heaving. Because of this, I am only eating 1 meal a day. I feel really weak because of this and other symptons include headaches, itchiness for some reason and shakes where I have not enough energy. But then there are times when I am on a comlete high and have a sudden burst of energy. Any ideas?