I am extremely sunburnt, especially my abdomen, back, upper thighs/behind and behind my knees. Behind my knees are swollen with a purple color, I m having extreme difficulty walking. There is shooting pains and weakness in my legs. I was experiencing nausea and vomiting for the first couple days with a fever and chills. Now I have chills, the pain and weakness. The sunburn occurred 4 days ago and I already saw a doctor who gave me a prescription of hydrocortisone. It soothes the skin but I m not seeing much progress and I ve never seen my skin this colour of purple before. Thoughts?