If you only have a mild headache, it sounds like you are OK. A whiplash accident can cause headaches without traumatizing the brain.

Don't be surprised if your neck develops soreness over the next few days. Whiplash can have a delayed onset of symptoms.

And, try not to worry about what may come. You just may cause it to be true. Anxiety can easily make a 1 on a 10 scale symptom feel like a 8 on a 10 scale symptom.