I’ve never had one last that long, so I second commenters saying to check in with a doctor. However, my go-tos are caffeine (usually chilled cola), paracetamol and ibuprofen, placing a cold wet cloth over my eyes and/or the back of my neck. In addition to darkness and quiet, of course. This regimen doesn’t make my migraines go away, but it takes the edge off and makes them more bearable. I hope any of this helps you out, good luck!