In my opinion and I am a 44 year old born at the McCoy Airforce Base
in Orlando, Florida... I have had hundreds of Sun burns but nothing as severe as what you're describing....but AS "Caryopteris" posted, that was very good advice on what to do for home remedy...My main concern is this happened Monday ??? Make sure you drink plenty of fluids like water/Gatorade, and take over the counter pain meds like Tylenol or ibuprophen for the pain But take as prescribed on the bottle...