If you're supplementing with iron and haven't had a blood test that tells you that you are deficient, it is especially important to also supplement with B12, because iron supplements can actually mask a B12 deficiency until serious symptoms crop up.
My first thought when I read about your exhaustion was B12, actually. Chronic stress can absolutely deplete this nutrient - I found that I was deficient and after starting on B12 shots once a month, my energy is SO much better.
It goes without saying, but a generally healthy diet is important, too - for detoxing, berries, tropical fruits, leafy greens & cruciferous vegetables (like kale, broccoli & cauliflower) are especially important. A glass of carrot juice with a shot of wheatgrass each night will help calm the adrenal glands (related to thyroid, and overworked in times of stress) so they can heal and you can sleep, with less anxiety.