What Causes Thinning Eyebrows, Exhaustion And Insomnia When Treating Hypothyroidism?

Hi, I am 46 years old, male. I am practically the poster child for hypothyroidism. But my blood tests show that I am in normal range for T3 T4 and TSH. Can you guide me as to which test to take next? My eyebrows are thinning, though I have a full head of hair. I m exhausted all the time, and suffer from insomnia. I am 215 pounds, and 5 foot 11 inches tall. I am about 40 pounds overweight. I am on the atkins diet, and I exercise (run 3 miles at a time) 4 days a week. I have been on this atkins diet for at least 5 years