Maybe MTBLover is onto something. Since you have scoliosis, maybe you are starting to have pressure on a nerve. Many years ago I had some headaches and dizziness that was ended by a trip to a chiropractor who did accupressure and pressed on a vertebra that was slightly out of whack. One trip, no more dizziness. Of course they did massage and relaxation things first before the accupressure. Now I visit a massage therapist who keeps my neck and hip working. Hope you find out it's a simple thing that's easy to fix.