Yes,as far as I remember, we done
neck exercise.(it was hanging our
neck and bringing counting on up
and down to the edge of sthg like a big table ) But it was few days before,probably 2-3 days prior to the symptoms. The symptoms had disappeared after few days and came again after 25 days and is persistant. To my greater surprise, performing the same exercise once again, made me feel better. I will go through the research you had kindly mentioned.