thanks for asking question
i gone through your query. your 12 year old son is suffering from GAD and
ADHD, and taking medicine . You consulted GP for his
fatigue and not feeling well. GP noticed enlarged
thyroid, and some
blood test was done which reported normal.
There is no thing to worry for enlarged thyroid.The thyroid gland size enlarge in this age group , the increase in size of thyroid is normal in this age, there is nothing to concern for present and future .size of thoird will decrease it self over about 6 months .this is normal part of development in adolescent.
There are many cause for faitiuge in this age group. so time medicine for GAD can cause easy fatigue. so talk with doctor who is treating GAD.
in this growing age requirement of all nutrients , esp iron and protien is increased. I generally tell my patient for proper diet or i supplement by food supplements
hope i able to answer your query
wishes you healthy family life