It's considered as a systemic illness and not just a headache. It's really a brain disorder. There are different subtypes of migraine. For some a simple remedy like cooling the forehead (icepack) while keeping your feet in a warm bath works. Although a long term cure is not available, there are promising new drugs.
Research has shown that the brain patterns do change 24 hrs ahead of migraine onset. There are a new family of drugs - Calcitonin gene-related peptide (CGRP) which works, but there are side effects including liver damage.
But later, Monoclonal antobodies (CGRP mAbs) were developed, not cheap but considered safe. Some of these are still awaiting for FDA approval. CGRP mAbs are the latest preventative drugs for migraine. Hopefully may be one day there will be a cure.