My father has had all the symptoms of hypothyroidism for decades. He has always refused to go for help. Now his symptoms are severe but his blood test showed normal thyroid levels. He has been independent and active all his life. His lack of energy, extreme sensitivity to cold etc. has now rendered him unable to look after himself. He will end up in a nursing home if we can't find a way to restore his energy but the doctors think it is just his age. How do we convince them to look seriously at his symptoms when his blood tests don't show a problem?