First week I kept getting dizzy at twenty minutes too, and then I realized I had left my water by the door and also forgot I had not eaten since late morning. I kept stopping hard at my building and that head rush was brutal. What helped was setting a timer to walk for one minute every five, carrying a tiny bottle, and doing a slow loop so I ended at a walk. Now I throw a granola bar in my pocket and eat half before I go. If the spinning keeps happening even when you do all that, I would book an appointment.
