A lot of hair comes off everytime I shampoo my hair. There is also a white substance that forms on my scalp. It seems to increase the fall. I have to shampoo every alternate day to keep the hairs clean, if I delay it then the hair falls more in the next wash. I also sweat a lot and that seems to cause more problem. However change of shampoo or water doesn't seem to help much as I have tried it all. It's been almost an year since this started , the hair grows back bit takes a lot of time. Any help?