I'm sure they're correct, but please check the reference ranges for the TSH and Free T4... I've never seen anything like them, even in those reports we've seen from Africa.
It isn't TSH that causes symptoms; it's too much/too little of the actual thyroid hormones, so even though the TSH is lower than normal, the Free T4 and Free T3 are not high, as we would expect with hyperthyroidism... If anything, the labs would indicate Central hypothyroidism, which is when the thyroid actually works fine, but there's a problem with the pituitary/hypothalamus axis, in which there isn't enough TSH to signal the thyroid to produce the hormones.
Joy, I believe that's what's on the paper. Can you get hold of the lab and verify the reference ranges, so we can try to figure out what's going on?
I wouldn't settle for having my son put on Ritalin, if there's a possibility that he has a thyroid issue!! Thyroid function is too important to bodily functions to just pass it off. ADHD symptoms can mimic thyroid symptoms, so your doctor needs to check this out thoroughly and not just dismiss it so casually.
In addition, if there's a pituitary/hypothalamus issue your son's other hormones could be out of balance, as well. That means, his adrenals, pancreas, reproductive organs, etc might all not be getting the signals they require from the pituitary gland.