How to relieve a sunburn?

I was at the beach all day today, and not being smart, I didn't use sunscreen on my back (I usually never burn, so I THOUGHT it was okay). Now my back is all red and hurts a little. What can I do to soothe it and get rid of the redness? I am putting aloe vera and Shea butter lotion on it every hour. Thank you! God bless<3