Could you be perimenopausal or actually going through menopause? It can cause dry eyes and those hot flashes can be only in your face. My eyes itched so bad and I use a plain eye lubricant. As for the burning face I take soy, but I still get flashes all the time.
Have you changed brands recently? I know different generics can have different fillers that some people are allergic to...also, could it have been something you ate, drank, touched, etc? Allergies are a weird nut to crack sometimes..keep us posted!