I'm ashamed to say it was only about 3 days and nowhere near the full amount each day. Felt too ill. Seemed to me the cure was worse than the illness. Then I felt guilty so about 3 days after that I started again and nothing happened. No sickness, no dizziness, nothing. Couldn't believe it.
At the moment I get dizzy only if I tilt my head back to look up, look down too quickly (pick the dog poo up slowly) or occasionally when I turnover in bed. It's a nuisance but I can live with it at this level.