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This is Dr. David
these symptoms may or may not be related to your thyroid hormone levels
you need blood test to check your TSH thyroid stimulating hormone levels and T3 and T4 levels to check if your thyroid hormone dose is right or if it needs to be adjusted.
your brittle nails can be due to poor diet, not enough protein in your diet, poor circulation, connective tissue disorder and other causes.
you could be low in biotin
when was the last time you saw your doctor to get blood test and physical exam?