Hi,thanks for query.First of all get your thyriod status checked again.Adjust the dose of drug after the reports.You need to consult an endocrinologist
to look for any hormonal
imbalance as you are growing facial hari and loosing from scalp.Another possibility could be some local scalp problem like dandruff
.Take good diet rich in vitamines,calcium and proteins as incase of lactating mother iron and calcium deficiency
is the commonest cause.
wishing you good health.