My doctor says my thyroid levels are fine but I still have brittle breaking nails, hair loss [eye brows] and hair not growing (body hair), and inner?

Other causes. Agree with dr. Villaplana. You might have to live with normal thyroid level for awhile to see the effects. However, if the symptoms are still there despite normal thyroid hormone level, then it's probably something else that is causing the symptoms and not the low thyroid anymore.
How long? How long have you been treated? If not being treated, test may need repeated. Other testing may be needed for anymore specific diagnosis.