Here's something i learned from a patient: make a pitcher of very black tea.
Let the tea cool to luke warm. Using a rag (so you don't stain a nice towel), dab the tea onto your sunburn
. Don't wash it off. Add more "coats" of tea if it feels good to do so. Let the tea dry on your face, and leave it overnight. Wash it off in the morning. Voila. Much better.