I'm 19 years old male and I was suffering from dandruff, my hairline started to recede from about a year ago, and my hair started thinning, I came to know that my hair is dry and frizzy, and also I got combination scalp, with dry ends and oily itchy scalp, so I started to apply coconut oil + castor oil 3 times a week, and tea tree oil one in a week, now my hair feels better, but recently I felt like having (sand grain) grains like dandruff on my scalp, I want to restore my scalp health and hair health. Please suggest me diet and medication for restoring my scalp health.