Yesterday I had a bad headache, primarily in my eye sockets. Last night I developed a rash ( no bumps but lots of solid red patches on my trunk and on the right side of my back). I woke up this morning with more rash, less headache (but eyes feel glassy), but now have an achy body and chills... But no fever or upset stomach or runny nose...no cough either. If anything the rash is sensitive, not itchy or painful. What is going on? Could it be a food allergy, an allergic reaction to spring foliage that is new to me, a flu? How should I treat this?