You need to see an ophthalmologist.
Dr. O.
Could you have been bitten by something, possibly in your sleep or do you have a sty that has become infected? Try some warm moist compresses until you are able to see your physician or better yet consider a trip to Urgent Care.
Our eyes are precious and nothing to be taken for granted. I hope you will soon be feeling better.
Good luck to you.
Tuck