Increase in facial hair along with scalp hair fall
usually indicate towards a hormonal
imbalance. If you have other symptoms like weight gain and menstrual irregularities as well, it is more likely to be polycystic ovarian syndrome
which is quite common in young females.
I would advise you to consult a experienced doctor for evaluation. Hormonal tests and ultrasound
may be advised to confirm the diagnosis. It is a treatable condition, so do not worry.
and shampoos are unlikely to help till the root cause is treated. Once your hormonal profile is normal, you can start therapy to regain some of your lost hair.