Help with a bad sunburn?

Ok so it is currently Wednesday, on Sunday I spent all day in the sun and got pretty badly sunburnt. I have blisters on my shoulders and the whole thing is so painful. Like I said its Wednesday so it's day 3 and the areas are still really hot to touch. I can't move my arms without pain, and my skin feels really tight. I put aloe vera cream on it, but I'm only able to put it on in the morning and night because my boss at work won't let me have time off and continues to give me 6-7 hour shifts while I'm in a lot of physical pain. I am really fair skinned so I burn easily, but this is the worst sunburn I've ever had and I am in a lot of pain. Any advice on how to clear it up? And how long will it take for it to go away?