I rubbed my itchy eyes and now it's really red, puffy, and watery. What should I do?

See a practitioner. If it does not improve. Rubbing itchy eyes can make them more irritated, so best to figure out cause.
Antihistamine. Rubbing the eyes may make the itching worse by releasing more histamine in a vicious cycle. The best thing to do is to rinse out the eyelids with cool water and begin a strong antihistamine allergy drop for relief - this usually needs a prescription.

Related Questions

I am experiencing itchy eyes, sensation of something in eye, shadow over part of vision and eyelid redness.

Eye symptoms. Your symptoms, especially the shadow over part of vision, indicate the need for you to see an opthalmologist ASAP. You MAY have a retinal tear. Peace and good health.