I have extreme fatigue , heavy head, dizziness , nausea . This happens frequently , almost always in evening. I will usually fall asleep and then wake up feeling worse than before. Any ideas to help me? This is extremely debilitating and interferes greatly with my everyday life. I thought maybe it could be some kind of dehydration or something but it usually happens about once a week. Its been going on for a few months now. I am a 20 yr old female with no prior medical history and have never had anything wrong with me more major than the flu . I think I may suffer from anxiety a little though. But this cannot be just anxiety. It is the worst I have ever felt and I just want to get better.