I've replied to a similar post some days ago, I've been having pain the eyes too. it started with a pretty bad red eye one night. I thought it was due to the eyes not being able to tear, maybe from a Neurological problem or Rheumatoid Arthritis.
there's a test eye doctors do to determine if the eye can tear normally. but I've never done it. I tried with rubbing a slice of onion on the cheekbones and the eyes didn't seem to tear much
thanks for the reply if you find out what it is please tell me my eye has got worse and my right eye is fine now, now it is my left eye
do you have any other symptoms at all?