What can i do for a really bad sunburn?

i went on a weekend family trip and i used my sunblock all except for yesterday and i forgot it. My chest, back, shoulders and the tops of my thighs are severly burnt. I'm using aleo gel and i have been using vinager. What else can I try I feel really crappy to and i'm drinkin' lots of fluids to rehydrate myself, i'm afraid i have sun poisoning. any tips will be appreciated.... Thx in advance