Was in rear end car accident 5 days ago. moderate damage to car. medium/moderate pain in neck trying to look up. felt fine till tonight. whiplash?

Sounds like it: Take it easy and don't keep testing yourself to see if it's better yet. Use heat or ice, tylenol (acetaminophen) or Ibuprofen if you can, and give it a couple weeks. Gentle range of motion exercises, massage and physical therapy can be helpful. If it still bothers you, a pain doctor can inject the small joints in the neck.

Strain: Possibly mild whiplash or muscle strain. Try some Motrin to reduce the inflammation.