Hair fall and dryness. Kindly advise!

Hi At the end of last winter I experienced extremely itchy scalp especially after washing my hair. I admit I was using hair dryer after hair wash since hair takes longer to dry in the north indian winter. I self managed the itchy scalp by stopping hair dryer use completely, switching to sebamed shampoo and application of curd, coconut oil, vitamin e oil etc on scalp. While itch is far lesser, now I have experienced extreme hair fall and have estimated I have lost around 3/4th of my hair. I used to wash my hair daily given the pollution and sweat in North India but now do it on alternate days. I am someone who always have thick abundant hair all life and always got complimented for it. I don't know why I am experiencing this and have never had such an issue. I have not been taking any medicine for some health issue which could have such a side effect. The only change in my intake is that I used to take femilon contraceptive oral which i stopped since May or June. Kindly advise