I don't know how long something like this will last for you. All I can say is what happened with me. For the first month I had what I called "sober hangovers". I'd wake up exhausted, with aches and pains, headache, etc. but most of all I'd be simply exhausted. One thing I did is I went to the doctor and had a physical and some blood tests just to make sure it wasn't an infection or something. I was fine according to the medical tests. I felt like I had chronic fatigue for about six more weeks. Then I noticed it started to lift. I also noticed that I was picking up my hobbies again, focused at work, and was exercising again. It's possible, in my case, that is was depression. I don't know for sure. People have also brought up the term PAWS. That might be worth looking into.
I hope you start feeling better soon. Thank you for posting. Hang in there!!!!