Are you taking vitamin D supplements? Dr. Nedley found that I was low on Vitamin D and gave me a 50,000 IU megadose to kickstart me, and now I take 4000 IU every day.
Are you taking anything or doing anything for the inflammation?
Are you sufficiently hydrated? Even mild dehydration can cause fatigue and brain fog. As a general rule of thumb, you should drink half your body weight in ounces of water each day, plus an additional 8 ounces for every hour of exercise. For example, a 100 lb. person should drink 50 oz. of water per day, and 58 oz. if they exercise for an hour.
How is your sleep/wake schedule? You might consider some light therapy to help get your circadian rhythm regulated.
All that said, sleep disturbances and fatigue are still the last thing I'm struggling with. I just do my best to stay awake during the day and sleep at night. Some days I make it, some days I crash at 4 PM.