I believe what you are describing is called auras. They don't cause the migraines but a precursor or a warning that a migraine is coming. If you get them often and over the counter medications such as exception migraine don't help then you should see your doctor.
During the migraine try and stay in a darkened room with a cool rag on your head until it passes. Without more information on your specific symptoms that's all I've got. Let us know how you're doing.
Nail patella syndrome, osteoarthritis, complex migraines, eosinophilic esophagitis, major depressive disorder, OCD, and fibromyalgia, IBS
Meds: flovent 220 mcg, flexeril 10 mg, zonisanide 100 mg, omeprazole 40 mg, Cymbalta 60 mg,dicyclomine 20 mg, elavil, 10 mg, Xanax prn, hydrocodone prn.