hair fall problem since 2007

Sir, I am 25yrso male, suffering from the problem of HAIR LOSS since 2007. While I was in college in 2007, I used Garnier HARD GEL to get stylish hair look but after 1 month of its use few small pimples emerged on my scalp and these were very itchy, I did use comb to scratch my scalp. The time countless hairs fallen and my scalp stared to be VISIBLE within 3-4 months, leaving very thin and much less hairs on my upper mid section of scalp.
Before using HARD GET hair fall rate was normal about 5-10 a day and I had rich density of hairs (2-3 hairs per root).
That time I consulted a homeopathy doctor who prescribed me Thuja, Nux 200 and Sulpher 30C. After using it for about 6 months I got some relief from itchiness but nothing much happened, so I approached a dermatologist who recommended me Mintop 5%, finax and scalp shampoo. The same time I shaved my hairs. When hairs grew up, I started to apply Mintop5%, those were thick even on upper mid portion.
But after using mintop and finax for 6-7 months, my hairs again started to fall. And from that time I usually shave my hairs when they start to fall very rapidly.
Except the upper mid section of my scalp, I have thick hairs.
There are many tiny (about 1-2cms) clean (i.e. without hair) spots on my scalp and a one inch area on my scalp that has only countable hairs.
I am a CA-FINAL student and I study in night. My father is bald and my grandfather was also bald but their brothers are not bald. Even my elder brother who is 30yrs and my younger brother who is 23yrs don’t have this problem.
Please recommend me medicines so that I can be free from this problem and atleast get thicker and strong hairs on that affected scalp.

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