I had flu symptoms: vomiting, dry heaves for 24 hours, and high fever/ chills for another 5 days. My temp returned to normal, symptoms left, I stayed hydrated although couldn t eat for 9 days so lost 10 lbs. I am now eating healthy diet, resting, but have not regained energy. I just sit or lie around, so fatigued. It s been 19 days. Is this normal? How do I get energy back?