Don't push through the pain. It's best to listen to your body and rest accordingly.

Trying to determine whether or not there was a "concussion" is futile and besides, your course of action will be the same either way. The headache could be from inflammation which can occur with or without a concussion, or from the neck injury.

The amount of rest you give your brain depends on the severity of the symptoms. And the type of rest you want to give your brain is to avoid high-level intense cognition like computer work or driving. So lower your activity level to a level that you can tolerate comfortably. Once your condition stabilizes and begins to improve, gradually increase your activity level.

Anxiety is linked to brain inflammation and concussions are an inflammatory condition so seek treatment to reduce related inflammation.