It's good that you are getting iodine and especially liver because the copper in it will help regulate iron. If iron isn't regulated, it can accumulate in organs including liver, kidneys, heart, brain, etc.
Beef liver is especially high in copper and active vitamin A.
I've found that getting enough electrolytes is crucial for sleep and fatigue. Potassium and magnesium are great, but calcium has helped me the most. ( I take a calcium chelate in divided doses, but food is great too, especially greens.)
If you don't get enough calcium, then phosphorus accumulates in organs, especially kidneys, and can disturb their function.