It is not necessarily normal to get sight loss with Migraine, however blurred vision is well know during an attack. Sounds like you need to see a Neurologist who is a 'Headache Specialist' to be checked out.
Yes, an eye check would be well worth it too!!
Co-Moderator of the Migraine/Headache Forum
DX: Hemicrania Continua, Chronic Migraine, IBS, Allergic Rhinitis and Heart Murmur
Meds: Imigran Injections, High Flow Oxygen, Mebeverine, Lansoprazole, Nasonex and Clarityn