Oh rats, KittyLady,
You've certainly got enough on your plate and don't need or deserve this on top of it all

....


.
It sure could be ON; especially if the pain is worse when you move the eye. When I've had ON, periodically covering both eyes to stop the affected one from moving helped to reduce the pain.
The purple color thing is a concern.
Mrs. D is right. Please get it checked out ASAP.
(Thanks Mrs. D...I always learn something new from your posts

)
With love, Erika