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If you're reading this, you're doing migranes wrong
Frequently enough that they know you're a sufferer, but not so frequent that you regularly have to take time off? In any case, you should let them know and leave now.
How can you tell that you've got one on the way? For me, it's a feeling of light-headed delirium, which meant that, for some years, my parents thought they were caused by "excitement".