Hi welcome to Health care magic forum.
Thanks for asking a question to H.C.M.F.
You are a 17 year old girl. You hair is getting thin and thin ,
dandruff, dry
scalp, you thought it to be harmonal imbalance, you also have
irregular periods.
The cause of thin hair could be dandruff,
anaemia, hypoprotinaemia, shultry atmosphere, and food habbits etc.
I advise you to
consult a dermatologist , or a trichologist, for diagnosis and treatment.
I advise you to take more of green leafy vegetables, pulses, fruits, juices, and proteine foods.
Avoid taking more of spices, junk foods, and oily foods.
Don't use different shampoos frequently, use only one brand, especially anti fungal.
Wishing for a quick and complete recovery.
Best regards.