Did your blood work include tests for Ferritin and B12 There not part of the regular blood tests done by most GP's unless there explicitely put on the blood work requisition. I was losing hair, and my Dr. checked my iron levels and both Ferritin and B12 were low. I started taking iron supplements and my hair grew back.
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"I danced in the morning when the world was begun. I danced in the moon and the stars and the sun". From my favourite hymn.
"If you see the wonder in a fairy tale, you can take the future even if you fail." Abba