What Causes Severe Hair Fall?

My hair is falling like anything while taking head bath. If i dont take head bath after three days the hair fall will be more. And After washing my hair a white sticky thing will be there on my sculp. If i comb i can see white sticky thing in the comb. I wash my hair cleanly, I rinse hair with sufficient water, but no use. After taking headbath also, sculp itching will start. Doctor, I am really getting irritated of this. Currently i am using Himalaya Shmpoo. Mine is curly hair.



Doctor, Could you please suggest tips to overcome this problem.