Lately I've been having a hot flushed face and a warm head. I've been feeling dizzy & tired and sharp pains behind my eyes. I sometimes feel nausious.

Dizzy. It is hard to tell exactly what you have-- could be the flu or a severe head cold. Glaucoma can cause eye pain, but not with fever or dizziness. Migraine headache can cause eye pain with headache, but no fever. Call your primary doctor for an appointment today if you still feel ill.
See your doctor. You need to see your doctor very soon. These could be symptoms of several illnesses that can only be determined by a thorough examination and lab testing if indicated.