Whether or not you have a legal and factual basis for a medical malpractice action after being prescribed medication for a migraine headache and then suffering a stroke is best addressed to a personal injury attorney and a medical expert who will need to give an expert opinion as to whether your doctor failed to adhere to an acceptable standard of care as a treating physician.I suggest that you consult with a personal injury attorney for starters concerning your question about a possible medical malpractice action.