I'm a software professional. Since one year I'm feeling dizzy and imbalance whenever I move my eyeballs upward and move my sideways(resulting in movement of eyes). And if I use my phone in sleeping position my head becomes tight and I feel stiffness in the neck. And also I feel imbalance when I travel in vehicles and use elevators. And I see lights flickering when I close my eyes at night(with low intensity) could this be an issue with my eyes or any other? And I've near sight.