hair fall ,dandruff,iching,thinning and greying of hair??

hellow!! my age 20 yr i am suffering these disease since may 2013 plzz help me to recover…

my hairs are very rough and extremely dry and also hairfall.I use heena because my hairs are white.i do all . possible treatments like spa, add many ingredient in heena taking vitamin d capsules, using coconut oil.i want increase my length but to extreme roughness I have to cut my hair .pls suggest as I m in very stress due to this