I was in two longboarding accidents and both accidents I got a whiplash injury and I keep getting headaches plus my neck is very sore and shoulders as well as lower back. I went skateboarding and fell on my head.

Rest until no pain! It could be that you sustained concussions and now struggle with post-concussion headaches. Also make sure that you didn't injure your neck via appropriate x-rays. Please rest and get examined before you attempt any more physical activities!