If acute otc meds like excedrin helps. Prescriptions such as triptans have been used to abate the migraine if severe enough. If this a chronic condition, reduce stressors, exercise, meditation, food triggers, acupuncture/yoga can all help. There is of course medications for chronic migraine as well. Keeping a log of your migraines may be helpful.
Many people just call a bad headache a "migraine" and this is not necessarily correct. You can try otc meds- tylenol, (acetaminophen) excedrin, antiinflammatory meds, etc. If these don't work, then go see your doctor for a formal evaluation and start treatment options. If it is a first time "severe" ha, get the evaluation sooner.