Suffered whip lash in my neck i had stiffness and pain for three days i've had headaches everyday since and a crackling sound in back of neck and head?

Whiplash: Whiplash has a strong tendence to be a chronic problem. The best way to avoid this is with vigorous and repeated physical therapy or neck exercises with heat. If you get the neck muscles really stretched out and loose (e.g., by stretching exercises, ear-to-shoulder, head rotation each side, and touching chin to chest--several times a day with moist heat or in a shower, you can heal this quicker.

Agree: Whiplash can be a choric problem. I have found that homeopathic bryonia can really help reduce those symptoms. Also consider acupuncture and chinese medicine. It makes a big difference with pain and healing. Those little neck ligaments when stretched can take a while to heal and these therapies can help a lot.