Hi riverleigh,
Dilated pupils can occur with migraine, but also with other serious conditions. If you haven't contacted your doctor yet, please do so. Then let us know how you make out.
It also is important to discuss this four day migraine. We don't like to see migraine pain last longer than 72 hours as this increases our risk for a condition called status migrainous and stroke. We have information on this here; https://migraine.com/blog/what-is-status-migrainosus/.
Please keep us posted,
Nancy