I was so happy to find that the vertigo I was experiencing by using the pillow was due to my neck and could be fixed. And thank you for fixing it. I feel much better this morning (Thurs). I am curious as to what is causing these set backs. One of the things I've been doing is to spend approx. 5 minutes training one of my little shelties. Teaching her how to heel (meaning she walks along at my left side) requires me to watch her so I can give her a treat when she's doing well. If watching her while we're moving causes the recurring vertigo, is there any thing I can do to prevent it (other than to stop training).