By ‘silent’ do you mean without the headache? My mum gets the visual disturbance only and a mild headache. Me, on the other hand, gets the ninja migraine lol.
I think there’s a million and one triggers and one thing I’ve learned over the last 40 years of suffering with them is your triggers can change over time. I had one yesterday, probably triggered by the cold wind. I get significantly more in winter than summer.
I take anti-convulsants as a preventative now so my attacks aren’t as severe but yesterday’s floored me a bit. To be fair, without the preventative tablets I would still be throwing up now, 24 hours later!!