From last three days I am having pain in the back of the head. Mainly the pain occurs when I am sitting up from lying position. The pain goes like a wave for a few seconds and disappears. Sometimes there is pain in the back of the eye. Mainly the pain is in the right side. There is sometimes ear pain type of sensation. The area where I am living is extremely hot and sweaty. What may be the reason for the headache when I am changing position and how to treat it?