How Can Neck And Hair Length Be Made Longer?

Hye doctor i am BBushra .how can i make my neck and hair longer,my hairs are very rough.My age is 20 and i am anemic my h.b is 5.1. My upper figure is also weak.My weight is 48 and height is 5f.3inches.Please also recommend me a good food to improve my blood.I have also very rare constipation i mostly pas stool after 8 days.Help me out from these matters i shall be very thankful to you.My email id is is YYYY@YYYY you can reply me on this too.