It's true that your TSH is low when compared with your Free T4/3. But you are under-medicated, anyway. Are you still taking only 75 mcg levo?
I don't think it's possible to do private tests for Central Hypo, because it involves testing the other pituitary hormones, like HGH and ACTH, etc. Plus you want a brain scan. But, you could do a 24 hour saliva cortisol test to see if that's been affected. Normally, it's an endo that does those tests - if you can find an endo that has even heard of Central Hypo!
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