I have 'silent migraines', which means that I don't typically feel pain with mine. Instead, what I experience with mine tends to be visual disturbances, i.e. seeing splotches of light, zigzags, the shape of a 'window' that slowly travels outwards. I remember this starting in middle school, and I just didn't have the words to explain my condition (leading to me getting reading glasses... they didn't help).
They've gotten more frequent over time and I strongly suspect that stress might play a big indicator. The worst of it tends to last up to an hour, and then my vision continues to be blurry for some hours more. I'm always nervous driving into town though because of these migraines. Sometimes there's an indicator that one's about to hit (such as my vision starting to blur, or a faint pressure in my head) but other times they just hit without warning. And then imagine the sun being out in full force, worsening my temporary blindness.
This has happened exactly one time while in town and I had to sit at the grocery store in the blazing heat and close my eyes and hope the worst of the symptoms would abate at some point; while melting. I definitely don't relish the thought of that happening again.