I have been feeling very tired lately. I sleep about 6 hours a night and when I get off of work I have no energy and probably sleep another 2-3 hours a day. I have noticed that I have had more and more headaches lately and began to bruise really easily. The scariest part I've began to notice is that everytime I stand up...I become dizzy and my vision becomes blurry. I was just wondering if you had any suggestions on what could be causing this.