When I woke up this morning my lower left eyelid was extremely swollen, but no pain or itching is present. The eye isnt red. What can I do?

Angioedema? Swelling of eyelid without any pain.rednass or discharge from the eye is usually due to an insect bite causing Angioedema.If it is so the swelling wll gradually go down.But if any pain,redness in eye or discharge appears,then you should see your doctor or see an eye Doctor.
SOAK. the eye using an "eye cup" (Ask your Pharmacist for one) USE WARM PLAIN WATER.....if no response or INCREASING swelling see an OPTHAMOLOGIST for an eye exam (NOTE OPTHAMOLOGIST=M.D.!) Hope this helps! Dr Z.