Hi, welcome to the forum, there are many possibilities of hair loss like thyroid disorders, pollution, hypervitaminosis A, excess testosterone in blood, syphilis, deficiency of biotin or zinc, any infection etc. These causes lead to disorders like telogen effluvium, Androgenetic alopecia, etc. You also need to rule out systemic conditions like renal disease, Cholestasis etc. which is associated with itching and facial swelling. You need to go for thyroid profile, kidney and liver function tests.
Taking regular diet which will give iron and other vitamins will help you. You should undergo thyroid, testosterone level etc. Massaging scalp increases circulation and help in re growth. Proper shampoo and conditioners will give good results. I suggest you to consult dermatologists. Take care and regards.