Is this just a winter thing? Or has it being going on for longer? Keep track of how you are over the coming months, and if you still feel like this in the spring don't be afraid to go to your doctor. Hopefully they will take you seriously if you still feel that you are unwell. Fatigue is an illness and can affect your life. I have noticed this in myself over the past few months but I never realised till recently how it was affecting me. Tiredness (even after a good sleep) and at any point in the day, headaches, dizziness, memory loss, sudden change in temperment, unable to organise simple tasks. I'm not trying to worry you, but if you have any of these symtems then get some advice. Simple changes can help, such as the right amount of exercise or a change in diet. It's only now when I look back over the past year or so that I can see how much damage it done to me without me realising it. I kept passing it off as normal.