Acute and preventive treatments for migraine, both old and new

Cliff has just started university this year and asks if you have any natural treatments for migraine. He says that he was diagnosed with migraine two years ago, and his doctor prescribed him sumatriptan to relieve them. However, since he has been at university, his migraines have increased in frequency. While the sumatriptan does work pretty well for most of his attacks, he would like something to help reduce the number of attacks he has.