She experienced fever anorexia weakness and right-sided chest pain.

I say the correct punctuation for this sentece is; She experienced fever, anorexia, weakness and right-sided chest pain.

Although experts disagree, I'd put a comma after weakness.

You are correct. The correct punctuation for the sentence "She experienced fever, anorexia, weakness, and right-sided chest pain" is to add commas between each symptom she experienced. Commas are used to separate items in a series, so in this case, each symptom is considered an item in the list. By adding commas, we can clearly distinguish between the different symptoms that she experienced.