I agree with the other posters. It takes a while to heal from all the damage we've done to our bodies. The first week sober I was exhausted. I try to give myself the time to let myself just be and rest when I need it. I feel pretty darn good at two weeks now. I think you are on the right track, and will start to see improvement with time.
I keep thinking of my sobriety like a newborn. It needs a lot of time and attention to continue to grow and flourish, along with proper rest and nourishment. It needs love and protection.
I hope you feel well rested soon!