Migraine

As the title says. For me it's always the same: at first, my boss is understanding, but when I miss work because of a migraine for the 15th time, that compassion kind of dulls away... At some point, they start complaining that I am unreliable and they always seem to be waiting for when I get better, as if there is a cure for this chronic condition.

I always feel like somehow it is my fault for being sick and I feel like I let my team down even though I know it's the last thing I want.

How do you guys cope with it? What do you tell your boss? How do coworkers view you? Any tips and tricks are always welcome!