Stress causes the release of a hormone called cortisol. Giving rats daily injections of corticosterone (rat cortisol) for several weeks kills certain brain cells. Stressing the rats each day for the same amount of time has an identical effect.
As soon as possible after the burn or scald, ideally within 20 minutes, cool the area of the burn using cool or lukewarm water for 10 minutes to half an hour. Do not use ice, ice water, creams, greases or butter, which can cause further damage. Butter and oils actually retain heat rather than helping to remove it.
When the sunburn turns red and painful, take a bath in vinegar and warm (almost cold) water. That'll take the sting out. I use a special lotion my friend makes that is amazing... but you can use shea butter, coco butter, aloe, colloidal silver (if you can find it, it is amazing!). Keep your skin hydrated.