Hi, I Am Just Concerned Because I Am Tired Much

Hi, I am just concerned because I am tired much more than usual and not getting done what I want/need to get done. I have had a bad cold that has lasted forever, and its not going away. This is very unusual for me. I turned 65 in November, I did get a flu shot. I take a nap almost every day which I NEVER do.
Other than that my health is good, and always has been, so this tired feeling is driving me nuts and I am not sure what to do or if I should be concerned. Thanks you