Thanks for query,
Your eating habit of slate pensil indicates that you have severe iron deficiency
.There is also asociated vitamin deficiency
leads to your hair fall
You must check your stool for worms before starting any medicines.If found it should be needed anti worm medicine full course under medical supervision.
Take iron injectable & vitamin preparation daily for at least 7=8 months.
Avoid junk foods.Take iron rich diet like brinjals,spinach more in diet.