God, that's awful, you were so young that must have been terrifying and frustrating. Glad you're able to medicate them properly now.
I was scared as hell when it first happened, thought maybe I had another blood clot in my brain (I seem to have lots of head trouble) but the pain was different and I could see fine. My left eye (always my left) would droop and I felt like I was going to lose my mind with the pain. I was the classic looney, I'd rock back and forth, scream, cry, slam my head into walls, hit it with my hands, etc.

It was horrific, as you and only someone who has suffered them can understand.
As for keeping something on hand, I've got a strong painkiller which I take if I really need it (for other things). It's a shame one of the best treatments is taboo/illegal. I have no idea where to even get that in the UK. Not sure it would matter anyway. They seldom lasted longer than 40 minutes, which makes it incredibly hard to treat. By the time anything starts working, it's about over. Sometimes I had a warning beforehand when something felt distinctly wrong on that side of my eye/face, but it was only a few minutes warning. So cruel.
My hands are shaking just writing about it. I think it must have traumatized me a bit.
I don't know what changed and why they came and went for me but I'm SO glad to be having a break from it.