Sever hair fall from past two years.

I am 28 year old female and my hairs are becoming white and very thin, facing sever hair fall since two years (from the scalp). Hairfall is so much that I only comb my hair once a day. Hairs are on the floor, on my dress and on the pillow also. In last 2 months I have noticed that my hair line has shifted backwards and when I do partition of the hairs, visibility of the skin is more as compare to earlier. They have become rough and does not look healthy anymore. Following are my queries regarding the same: 1. As a girl with long hairs I understand regular hairfall is normal but why is it happening so much? 2. If I have to take a medical treatment then which one will be better for this problem homeopathy or allopathy? 3. Is this completely curable then ideally how much time will it take? 4. Anything specific that I should apply on hairs or eat or drink. I had good quality long hairs but due to hairfall I have shortened it till shoulder but now also it's not stopping. Please help