Suggest Treatment For Tiredness, Forgetfulness And Slow Reflexes

Hi, for the last 2-3 months I have noticed changes within myself. I have always been the type to be organised and on the ball with things. The last few months I have been forgetting things, feel absent minded, tired, sometimes it feels like my brain doesn't want to communicate with my mouth, i feel different. Even notice a different driving (my reaction time is slower). Is this something I should be seeing a doctor about?