First start taking healthier diet and large quantities of water. Because lack of both above things always lead to hair loss.
Main things which need to hair growth is selenium, phosphorus, magnesium.
Internally or externally both method only help.
Use mild shampoo.
In Homoeopathy one complain have multiple remedy which suits you all depend upon your condition.
Few remedies are like
Embelia, bramhi, jabrandi, acid phos, selenium, and many more.
Next Steps
further detail about medicine then consult here online through this platform.