I been getting the same problems this year and also feeling sick, I have been taking the extra strong power pain reliver tablets from tesco (they contain aspirin and paracetamol) as soon as i feel it starting. Normal paracetamol where not doing anything.
They really work! Only thing that ever has. They're not cheap (�7.95 for two tablets - dosage is only one) but as you'll know, when you've got a b*gger of a migraine money's no object!