I don't know if this will help you but here is my story. In the spring of 2003, I began experiencing all of the symptoms
you describe (lightheadedness
, spaced out feeling, nausea, teeth/jaw pain, ear ringing, difficulty concentrating). I also experienced a lot of skin sensations such as tingling, prickling, tickling, pin pricks, ear tickling, flickering light in peripheral vision, etc. I have also had many tests that indicate nothing is wrong.