could be pms, could be the flu. either way, stay in bed and don't eat/drink any dairy products, because they will make the nausea worse. try drinking ginger ale and eating crystallized ginger, because they'll help settle your stomach.
You have outlined acute, feverish symptoms characteristic of a mild infection or allergic response. None of the discomforts you have mentioned are premenstrual, unless your periods are already in a mess. Ask for professional help if you get worse, but I would imagine you would benefit from teaspoon doses of a mixture of liquid honey and Cinnamon powder. And, yes: ginger in any edible form will settle the nausea.