Massive hairfall in shower. Be worried?

Hello Doctor! I have thin hair from the begining but never had any hairfall problem before. About two months back, I started noticing that whenever I wash my hair, at least 50-60 strands of hair I lose. Previously, my hair used to fall during shampooing my hair but not more than 10-15 strands. I have strted getting greys now. I have 2-3 grey hairs. My front part of the scalpa and the vertex (crown) is thinning badly. There are itching in two- three.  Places on the scalp even after washing my hair with shampoo. I haven't have any lifestyle change or food habit change recently. I don't use any harsh shampoo or hair product but still getting this massive hairfall. Do I need to be worried? Please tell me the solution. Thank you.