I have very thin hair my head is seen through my hair became like this because of chemotherapy which started in year 2013 have completed in year 2015 November my whole treatment for cancer (acute lymphoblastic leukemia) 4 months back I'm 20 years old will my hair get back as if it is before chemo it's been 1 year my hair is in same position I'm not getting hair on my top it's patchy suggest me what to do.