Pain in back side of neck after regular study of 2-3 weaks due continuous head down position of head for writing and reading purpose, also pain in jaw line, teeth, muscles or nerves in front part of neck. Eyes are also light sensitive and because of which I have headache. Unable to face sunlight, headlight of vehicles, unable to cross road due excessive light, unable to read in tubelight, I m using very low intensity bulb for studying. Whenever I go out I wear black sunglasses to prevent my eyes from sunlight.