...greater amount, how can i tackle this hair loss within 1-2 months?? Becoz of this less amount of hair are present just above my forehead which looks very odd.
Is applying fresh corriander leaves helpful in regaining those lost hairs ??
Which products/ medicines/home-made tips work best to tackle this problem ??

Further my hair is thin, how can add volume to my hair ??

Stress causes hair loss like you describe, also dieting. Get yourself some MEGA Vitamins and in a couple of months, you won't be able to tell where the hair was gone.

Adding products to your hair, root lift lotions will make your hair appear thicker. Also a layered cut, ask your beautician for help.

Boil a tsp. of methi seeds in a cup of coconut oil till the seeds splutter. cool . apply this oil daily , lightly massage the roots . your hair will stop falling within a week.