What Causes Headache, Lightheadedness, Sweating And Blurred Vision?

I woke up with a headache today around 6am. Went to work at 7 and took a aspirin and a benydril around 8 thinking it was sinuses. Shortly after I started getting lightheaded. The light headedness continued though the morning then around noon I my whole body was sweaty, shaky, clamy, weak, my pupils were extremely small, and my vision got really blurry. It took about 15 to 20 minutes for it to pass but now I m tired.