People with upper neck injuries due to concussion forces have found help with chiropractic, physical therapy and even osteopaths. The treatment should be gentle. No aggressive 'twist the head and pop the neck.' Also, PT's should not be pushing for range of motion, at least not in the beginning. Treatment should be focused on getting proper alignment/position so inflammation can be reduced. My PT did gentle traction and mobilization.

It takes weeks to heal these neck issues. Ligaments get stretched and strained and need to tighten up to hold the vertebra in proper position. It is extremely important to be disciplined with head and neck posture, especially when at rest or sleeping, over the next month or two. While treatment is ongoing, frequent icing can be beneficial.

The Vitamins sticky at the top has links to Upper Cervical chiro organizations and a recipe for making crushable ice packs.

Your doctor was off on his claim of healing from the concussion is a week or so but he was dead on about the whiplash.