I've had this before, TWICE. Hence I know the symptoms by now. I'm having a bad viral eye infection. Nothing too serious if treated right.
The symptoms: red eye + eye pain + crying eye + very strong sensitivity to light.
Hence although my eye patch looks serious, it's only to protect it from the light. I've been prescribed tonight at the emergency unit of the Quinze-Vingt hospital (interesting story about this place...) a number of medications: hope it works, as my usual eye doctor does not work on weekends... A rather tough man, but excellent doctor. I'll check with him on Monday if I'm not better.
And by the way, I've been having bad symptoms since wednesday... Putting work as a higher priority was not a good idea...