Very bad sunburn, help? :(?

Yesturday i went out on my boat fishing with my dad, and i didn't put on any sunscreen. (Bad mistake) I have a VERY bad sunburn on my upper back, and on the back of my shoulders. I've tried spraying vinegar on it, but so far it hasn't helped! Does anyone have any home remedies that I can try, that work QUICKLY? I just can't stand the burn and i cant walk, lean back, i got no sleep whatsoever last night, urg i just want it to go away :(