Lots of good suggestions here. See a doctor and get a blood workup. Ask about side effects of meds you may be on like statins that could cause some of the issues. Track your sleep with a phone or watch app. Even if your asleep for 8 hours, it doesn’t mean its restful sleep. Also could be worth asking the doctor while your there about sleep apnea. Exercise regularly, doesn’t have to be much just something. Eat really clean for a week or so and see if it helps. But yeah, see a doc and describe everything to them. Write it all down before you go in so you don’t leave out important details.