Sporadic eye pain

Approximately one year ago (March/April 2006), I started experiencing some pain in my eyes. I went to an optometrist, who said I had (if I can recall correctly) a minor allergy-related infection in my eye. He prescribed some eye drops (I believe it was Lotomax), and the pain more or less went away. It started coming back several months later, so I went to another optometrist, who prescribed Alrex, Lotomax, and one other I can't recall. She said it was some form of conjunctivitis and that the drops should take care of it. Over the course of a few months, she said it started to clear up.

Eventually, the pain came back so this time I went to an ophthalmologist instead of an optometrist. She said I had Giant Papillary Conjunctivitis, and prescribed me nothing, as she said all the medication deals with symptoms I don't have (itchiness, runny eyes, etc). Discontinue contact lens wear was the onle thing she said to do. Pain only got a little better, up until a few weeks ago.

I played golf, and that night, I got a searing pain in and behind my eye that was so bad I couldn't function and was forced to sleep. Since then, the pain has been pretty rough. I had my follow-up exam, and she prescribed me Alrex. She also said I might have sinus issues and suggested some basic OTC sinus medication, which helps a little.
So, here are the current symptoms: sporadic eye pain, from dull to sharp, that is never localized in one specific area of the eye. Often causes minor headaches and heavy eyes/eyelids. Ibuprofen helps on occasion, as does the OTC sinus medication.

My hope is that it's nothing more than allergies, as the pollen level in our city is REALLY high, and my eyes really started hurting again when I spent about 5-6 outdoors playing golf. Someone suggested it might be symptomatic of multiple sclerosis, and that terrifies me to no end.

So, if anyone has any advice, or would like some more information, please let me know. Thanks.