serotonin agonists are used in migrains, both ergot and non ergot. maxalt is a nonergot serotonin agonist that might be worth a try if you talk to your doc about it again. caffeine is always a headache medicine which also constricts blood vessels. its in exedrine. 100 grams of pure caffeine powder can be obtained from bulknutrition for 4 dollars. jet alart brand caffeine pills are the cheapest commonly sold caffeine pill. but maybe you are already a caffeine drinker and it doesnt help anymore. cutting caffeine will for sure worsen migrains in people who get them. hmm what opiates or opioids did you have a bad reaction too? it might be that you have a bad reaction to any drug that acts on opioid receptors, or it might be a specific family of opiates and semisynthetics.

PS if you dont intake caffeine regularly and decide to try it, its better to try peices or halves of a pill rather than full 100 or 200 mg pills. MINIMUM dose necessary should be used combined with asprin or ibuprofin. ask your doctor about this first.