A bad headache really is among the worst things one can experience. I luckily almost never do. It's the only thing I've ever experienced that I could imagine leading to suicide were it to be chronical with no cure. Not even a bad depression has made me imagine that.
Dang, I'm in the same boat. Botox injections have started helping, but there's usually several weeks at a time where every day I have migraines. If I didn't have to help with kids and family, I'd probably just be in bed half the day. But, as you said, you just get used to it.