It should come back to normal but it couldtake time. Call the eye doctor.
For future reference - be aware of what you put in your eyes. In recent years companies have been forcedto put preservatives in just about everything. Make-up, eye drops, moisturisers - everything. mother in law was using a specially formulated low-allergy make-up (very expensive) and found she suddenly began reacting to it. She first noticed this reaction with a Vitamin E cream and so was saying she was allergic to Vitamin E. But I've seen her spill sesame oil on her skin and not get a reaction - sesame oil is a rich natural source of Vitamin E. So I have finally persuaded her to test the theory and I'm sure - her problem is preservatives, and the sudden onset of problems probably coincides with that company being forced to use preservatives. Interestingly, sis-in-law developed similarproblems with the same cosmetics at exactlty the same time.
I first got contact lenses back in the 70s, when it was easy to get saline drops with nothing but saline in them. But when I recently went back to wearing contact lenses acouple of years ago, I had a horrible time trying to find drops I could use. My eyes were really sore so I went into a pharmacy to buy some soothing eye drops, and ALL of them were a problem. I couldn't work out whay my eyes were so sore when all I was doing was putting pure saline into them - until I found out that the "pure saline" had hidden preservative in it (not divulged on the pack).
What I've had to do - I buy irrigation saline in plastic ampoules and use that as both eye drops and soaking solution. I rang the companies and asked their advice. Oone company sent me some soothing eye drops in individually-packed ampoules - very kind of them, except that even these cause problems andwhen I did some more digging, I found that they also had preservative - a different kind.
Something else I do which the eye doctor told me was NOT a good idea - I make my own saline. We have triple-filtered water which I boil, then I add the correct amount of salt (I used to be a lab technician). The crazy thing is, it was perfectly acceptable to do this back in the 70s, but isn't now.
I have to use the modern soaking chemicals to clean the lenses, I uses the least chemical of them (the hydrogen peroxide-boosted saline) but it still has prewservative in it, so before I put my lenses in, I rinse them thoroughly.
And when my eyes are a bit dry, I'll either splash tap water in my face, or I'll use some preservative-free injection saline in my eye dropper. If the stuff is good enough to be injected, it's good enough to drip into my eyes.
Seriously - I have no alternative but to be this fussy. Preservatives are EVERYWHERE! I am OK with cosmetics containing preservative, except if they get near my eyes. But I do make a lot of my own (saves money too) and have found that the best moisturiser for the eye area (for me) is vegetable oil - the sort you could use for cooking. If I'm cooking and get a drop of oil on my skin, I rub it in. I'll wipe my hands off on my arms, my legs or my face.
I don't know if any of tis is helpful for you - I hope so.
I hope your eye gets better soon.
Marg