Excess hairfall. Control the hairfall.

I recently shifted to Delhi and have been experiencing excess of hair fall. I dnt have any other issues of irregularities with menstrual cycle or weight changes or skin issues. The hair fall prob doesn't run in my family except for the very fact that my father's side has thin and brown hair and I have inherited the same. The last hemoglobin test was done two months back when I fell ill n the hb level 13g%.the last thyroid testing was done 5months back on a routine basis which was normal.I am preparing for my pg exams and I am under stress.my scalp is generally oily n harbours dandruff which isn't new. Bt due to pollution here the it becomes oily in just one day and hairfall increases more. Bt the hair fall is putting me into more stress. I started taking Biotin tablets od since last 11days. Please suggest something that can control the hairfall.