Hair fall and itching of scalp. To me.

Hi, From last month I am observing lot of hair fall, every time I wash my hair lot of hair fall occurs. After washing within 2-3 hours I can feel some itchiness in the scalp whether applied hair oil or not. Next day with dry hairs it start falling again and at the end of the day hair becomes messy and scalp becomes oily with itchiness and hair starts falling whenever I touch my hairs or try with little force to pluck, I can see hair comings in my hand. I tried 2 shampoos and even Pears soap but the problem remains same. I tried applying hair oil also of 2 types still no rescue from it. If I applied hair oil or not the scalp becomes oily after 1 day of washing and also the itching starts. I already see the bald spots on my head and finding no respite from the problem. Can somebody help me with this or things I can do from my side. That will be of very helpful to me.