Lisa - possible, but not too likely. Any way you could encourage H to get his blood tests rechecked since he is not taking his thyroid hormone? Might give his doctor a chance to talk to him more about it. This is not just about fatigue, weight gain, or even depression - having a low thyroid and not treating it can cause your cholesterol to rise and increases your chances of a heart attack, so this is not anything for a man to fool around with.
Ellie