I read your question and I understand your concern and fear of other attacks. I am not sure what do you mean by inhalers. Generally the most effective class of drugs when the usual painkillers you mention fail, are the triptans, like zolmitriptan, sumatriptan etc. Careful if you have ischemic heart issues, it is contraindicated in those occasions. Other alternatives are opioid analgesics or ergotamine. These options can be combined with a dopamine antagonist like prochlorperazine. I hope to have been of help.