This sounds much more like an inner ear infection or the like. When it is so definitely position-related and movement-related. Time to have a doctor take a look. A really good look. I went through over 6 months of just what you describe after the car accident, despite who knows how many doctors looking me over in general, including ears. Then, when put on an antibiotic for something else, the dizziness went away in less than a week, and never came back. If someone had listened and taken a good look earlier, I could have been spared seven months of stomach-sickening room spinning.