A few quick questions and I can help. How long has this been going on ? Is it one eye or both? Does anything make it better/worse? Have you had any problems with the eye before? Does it appear to have anything in it? Do you have any headaches with the pain?
Glad to be able to help,
Have you had any other signs/symptoms with the pain? Any Fever or nausea?
I believe we are close to an answer,