Welcome to HealthcareMagic forum,
rathin ,the hair with white bulb you are loosing is called telogen hair(a type of hair which is in the falling stage)...and if you are loosing this kind of hair in bunches every day,then the condition is called TELOGEN EFFLUVIUM
...There are various causes of this kind of hair loss..You have not mentioned your age,kindly do so...Treatment depends upon the cause ..like it can be iron deficiency
or stress,any chronic illness(typhoid,jaundice
etc)...etc...Standard medication for this problem would be tpo apply minoxidil
sol locally over scalp twice a day...take tab boitin aswell.Consult a dermatologist
for proper work up and treatment.