It is very weird that I'm feeling dizzy when I read in a car or metro. This never happened before. It's been very difficult for me as I am a teacher and have a lot of work that could be done when I'm travelling back and forth to the college. I suffer from headache and due to this problem I'm not able to teach and do my work properly. I'm not able to find the cause of such a thing. Can you tell me what are the causes of motion sickness? It’ll be very generous of you.