Suggest Remedies For Chills, Muscle Pain Behind The Legs And Arms?

I have chills, muscle aches in the backs of my legs and some in my arms. the aches are only when i sit or rest, when i walk, i don t feel any discomfort. my skin hurts--like how you feel when you are coming down with the flu. i have a slight headache, and i am tired. this started Wed and the muscle aches are worse now. i have no nausea or vomiting. don t know if this is a bug, an infection, an allergy or like a vitamin deficiency. i am usually healthy and want to feel better.