The physical act of Spinning won't damage your vestibular system. One of the treatments for it is actually increasing the symptoms to desensitize a person to the sensation. I'm not suggesting this though for you; an individual that I knew with the condition, that received the desensitization procedure, had an unusual issue with nerve responses that caused it. There is a multitude of factors that can cause this condition. I've known several people with it and from their description I can understand how bad it can get for you. If, you haven't already done so, I suggest you see a Doctor for it. There are tests available to pinpoint the cause and treatments than can help. Good luck to you.