'Silent migraines' - do you have them?

I've just had a 'Silent Migraine' my first in over 15 years, so three in my lifetime so far.
Silent Migraines (for me) bring no headache but a flashing bright zig-zag aura that obliterates my sight. Thankfully I was able to get in my darkened bedroom before it got too bad.

I find them very frightening, they come unexpectantly, with no warning...they leave me feeling grotty, tired with a dull headache. This one only lasted about 20mins, another, years ago, lasted around an hour.

Does anyone else on GN experience these monsters? How often? How do you cope? Any tips???