Hiya
I suffer from migraines, unfortunately. The "aura" can look like a few different things... mine are ziz-zags... and it means I can't focus properly.
Take some painkillers as soon as this starts... it can last for a few minutes or much longer (if you are unlucky).
Once the aura disappears you should then experience a thumping headache on the side of your head. (By this time, i'm in a darkened room, preferably lying down in bed.)
And then you can start feeling nauseous.
When i had my first migraine - i didn't know what it was, and I kid you not, i thought i was having a stroke or a brain haemorrhage. It was really scarry.
Take some tablets now!
Lynne