What Would A Doctor Do To You If You Had Sun Poisoning? How Would The Doctor Know?

The doctor would need to do a photo test to be sure, but most doctors would know when they see it. There is a rash that forms on the skin. Lots of times the skin gets sensitive from medication and then has a reaction to UV light.
The treatment of this is nothing big. You will need Beta Carotene, or Omega-3, or protein, or vitamin B3, C, D and E, or Aloe Vera. You may need them all but they are also good for you, so don't worry.