I started getting miagraines monthly right between my periods (oh joy!) at about 17. Fortunately, mine are generally 12 hour events, unlike my mother's whose were 3 day events.
Mine always start with auras of 3 ovular shaped dots (one pinkish, one greenish and one blueish all outlined in yellow) that go floating across my field of vision. Within two hours I will have a raging miagraine. My miagraines always creep up the right side of my neck. Sometimes I can slow the progression of the headache by freezing it and taking Excederine early & as often as is safe to do so. Once the headache starts though, I'm pretty much useless for the next several hours until I puke and see all the floaty auras go racing away. Then sleep, dark and more ice seem to do the trick. I usually spend the next day feeling like I just spent the previous night wrestling with a Mac truck.
Chocolate, cheese and red wine are my lethal foods and I have to avoid them at times when I'm prone to get a miagraine anyhow.
In my case, they're hereditary. My grandpa routinely got them until he had his thyroid removed due to thyroid cancer. He's been miagraine free now for 40 years! My mom started getting them monthly in her late teens and still does, but has Immitrex, which has been wonderful for her. I get them. My younger sister gets them bi-monthly. My cousin (through my mom's side) also gets them bi-monthly. Neither of them has really predictible cycles either so I wonder if that's why they're more bi-monthly than monthly (lucky me). I did only get them bi-monthly while pregnant, both pregnancies, and still now while breastfeeding, but it's just as bad because I can't really take anything for them now.
Mine always start with auras of 3 ovular shaped dots (one pinkish, one greenish and one blueish all outlined in yellow) that go floating across my field of vision. Within two hours I will have a raging miagraine. My miagraines always creep up the right side of my neck. Sometimes I can slow the progression of the headache by freezing it and taking Excederine early & as often as is safe to do so. Once the headache starts though, I'm pretty much useless for the next several hours until I puke and see all the floaty auras go racing away. Then sleep, dark and more ice seem to do the trick. I usually spend the next day feeling like I just spent the previous night wrestling with a Mac truck.
Chocolate, cheese and red wine are my lethal foods and I have to avoid them at times when I'm prone to get a miagraine anyhow.
In my case, they're hereditary. My grandpa routinely got them until he had his thyroid removed due to thyroid cancer. He's been miagraine free now for 40 years! My mom started getting them monthly in her late teens and still does, but has Immitrex, which has been wonderful for her. I get them. My younger sister gets them bi-monthly. My cousin (through my mom's side) also gets them bi-monthly. Neither of them has really predictible cycles either so I wonder if that's why they're more bi-monthly than monthly (lucky me). I did only get them bi-monthly while pregnant, both pregnancies, and still now while breastfeeding, but it's just as bad because I can't really take anything for them now.

I don't think my neurologist is the brightest bulb in the box... but where I live there isn't many options.
Seriously, I had no advance warning, it was a 72 hour trip, and it was no fun (especially not without you!) 
This was back before there was any migraine drug on the market, so it was dark room, cool compress & sleep it off.
We still have no idea what her triggers are. It doesn't appear to be foods, and isn't related to her cycle. Stress could easily be a trigger for her. She does not get auras. This year she started with a migraine the last day in February and it lasted until the middle of June. She was incapacitated & ended up on homebound instruction. They'd put her on 2 preventatives...an anti-depressant & an anti-seizure med hoping to stop the migraine. It wasn't until we got her into Children's Hospital in Philly that we were told that wouldn't work. They admitted her & did an IV with DHE. 
I think we get the same kind of auras! Your description sounds very close to what I get - the dot opens up and spreads and "sparkles" and slowly floats off the range of vision. This is a very interesting thread, as all the auras can be so different!