Hair Thinning and loss

I'm a 26 year old woman, and I find my hair thinning quite alarmingly - not hair fall per se, but I find the strands of my hair (especially on the top portion of my head)have become fraile and extremely thin.
This began to appear when I was dealing with my mother's illness and i lost my job as I needed to be with her. My hair loss was severe and I had an extremely sparse path, right above my left eyebrow.
I visited a homeopath, and began his medicine - within a month i found my left eyebrow thinning horribly.
I consulted a skin specialist then, who said it was a vitamin deficiency and prescribed Biotin and an amino acid supplement.
My thyroid tests came back fine. I could only take the Biotin as I reacted badly to the amino acid supplements and my hair condition stabilized, and the eyebrow got better.
I have to mention that both my parents have been prone to hair loss and I am afraid this is hereditary. Also, I am inclined to gain weight very easily. At 15 years I weighed 95 kilos. Today with exercise and a controlled diet I weight 65 kilos, at 5'9 inches - I have to mention that my diet is controlled and I eat very little in comparison to other people. But I do eat healthy as much as possible.
A breakup of a relationship that was dear to me, is a constant source of pain and anxiety. I am often depressed and I react badly to criticism. I also sweat excessively on my feet which causes an unhealthy odour.
I am in good health otherwise.
I would be very grateful if you would prescribe something to make my hair thick again - I don't want to go bald.