My mom is 56 she recently felt similar to you. She said she had "dizzy head". She would feel dizzy upon standing or changing positions. She also felt little disoriented. Her doctor said she had an inner ear infection, and it was throwing her balance etc... out of whack. There was no treatment buit it did take about 3-4 weeks for her to finally feel better. Call your doctor and him if this could be a possibility.
Are you having in muscle pain or fatigue? This is a long shot but sometimes after a neck injury you can develope fibromyalgia symptoms, feeling disoriented or unable to focus is a symptom. Have you had any blood work to rule out anything major? Do you have tender spots on your body, like when you put just a little pressure on a certain spot it feels very sore, or a deep achy feeling?
bdm92