I had an occular migraine once. Scared the hell out of me. 95% of my field of view became blurred, and almost as if I was looking through extremely cracked glas

I had an occular migraine once. Scared the hell out of me. 95% of my field of view became blurred, and almost as if I was looking through extremely cracked glass. No pain or headache but I had an incredible sensation of pressure centered behind my eyeballs. By the time my wife drove me to the ER, it had subsided completely. Maybe an hour after the onset. At the time, I was 4 weeks deep into a 6 week crunch (the worst of my career) where I was pulling successive 90+ hour work weeks. Have never worked over 40 hours since moving off of that project. Have never had an occular migraine since. Truly hope I never experience that again. I can't imagine going through them every few months...