What Causes Blurred Vision With Severe Migraine?

A few hours ago, i was reading something when my vision started getting blurry. Within 15 mintues, I was seeing spots everywhere and it was so blurry I could barely see straight. I could feel a headache coming on along with dizziness. Its been about 2 hours now, and my vision is back to normal, but I have the worst migraine of my life now and I feel like I'm going to puke because of it. My eyes are aching too?