thanks for that picture Rachel.
From what you have posted, the way the swelling suddenly came on it can be a couple of things.
One would be an allergic reaction to something. Swelling from allergies doesn't always have to itch.....
Another option would be blepharitis
with meibomian gland infection and possible early stye formation.
I think you can try a couple of things at home and see how it goes.
Get some 1% hydrocortisone
cream and put it on your lid 3/day. In addition use some warm compresses and baby shampoo lid scrubs.
In the shower, place the shampoo on your index fingers, close your eyes, raise your eyebrows (to stretch the skin on your eyelids) and scrub back and forth along your eyelashes for 3 to 5 minutes. The hot water in the shower helps to soften the plugged oils in the glands while the mechanical scrubbing with your soapy fingers removes the oils.
If things are not better by Sunday then I would get in to see an ophthalmologist
for a complete eye exam.
Does this answer your question to your satisfaction?
I hope this information was helpful for you. But I do work for tips so I want to make sure you are happy with me before rating me. If you have another question on this or a related issue feel free to fire away. And please let me know if the rating system gives you any troubles.
Thanks in advance,