Robin, I never said anything about commercial experience and I did say I learned this when I came to highschool. I really dont think I am acting like an expert, not in any way. I have been using this method for almost 2 years and I rarely get light headed. The OP does not have to do what I said. Just a suggestion like every post here for every topic like this. I am not a Doctor, but what "health issues" can develop from this?