Hi,It is very difficult to diagnose your problem without knowing following, 1-Age & sex of patient. 2-Associated problems like vomiting,headache,etc. 3-any other problems in eyes like redness,watering,discharge etc. At this time I can only say that you may be suffering from either of the following diseases, Glaucoma,Iritis,Migrain,Herpes&May be some space occupying leision....... With out knowing these factors I can t suggest any treatment And investigations. This is all What I could comment .