The soft tissue at the surface of the skull has lots of nerve endings that get injured. These take a long time to heal thus leaving the head with a sensitive area.

There is a thread in the stickies at the top about vitamins and supplements. The post on Nov 8 2014 (number 101) has the latest update of the vitamin regimen is have used for years. Here's a link, http://neurotalk.psychcentral.com/thread181974-11.html

The B vitamins are important for the healing of the myelin sheath that protects nerve fibers.