Sounds a bit like Post Acute Withdrawal Syndrome - PAWS. Your body is readjusting and all of a sudden isn’t getting the regular sugar supply from alcohol it once had.
I get fatigued even now and nearly 5 months sober. It does get better over time and it’s about 1 in every 10 days now. Eat healthy, lots of green and red veg helps your energy and perhaps take some iron supplements.
Stay strong, it does get better and your sleep will definitely improve.