I want to thank all of you for this information!
I have been taking aspirin to see if that has any sort of preventative effect on the flickering. I'm not sure if it's having a positive effect, but I do think it is helping - I forgot to take it this morning and have been getting the flashes again. The flickering mostly stopped for a few days, but just a few minutes ago the lights seemed to flicker about five times in five minutes.
So I guess this is still a trial and error process. The only pattern I have been able to absolutely identify is that it only happens in low light environments.
I wonder if it is a hypersensitivity to fluctuations in the power. I have always been more sensitive than other people to that - is it possible that it's suddenly become 10x worse? I feel like it is crazy to say that.
Hankster, I love your messages too