Can migraine be misidagnosed as motion sickness?

Yes. Migraines can have some of the symptoms of motion sickness including nasea and headache complaints and can be triggered by motion type events. Nevertheless, a trained professional should be able to seperate the two. Regardless, avoiding the offending event or taking over the counter medications as appropriate prior to the event should be helpful.
Not likely. While both may have nausea and vomiting there is otherwise little similarity. Headache is the primary complaint in migraine and has nothing to do with motion sickness.

Related Questions

Can extreme motion sickness (especially around more hormonal times of the month) (not pregnant) be a sympt. Of seizure? Vest. Migraine?

Unclear. I apologize but I do not understand exactly what you are asking. Extreme nausea should be evaluated preferably by a gastroenterologist. If the nausea is associated with a Migraine headache then it should be evaluated by a neurologist. If you do not have seizures or a known seizure disorder then nausea is not a likely indicator of future seizure activity.

What causes motion sickness, nausea, vomiting, dizziness and migrain headache?

Bad migraines? Well bad migraines can cause those things but I would see a neurologist if your headaches are that bad! One, it is important to rule out other causes and two, you could undergo migraine treatment if that's what it is. Good luck!
We don't know. The exact cause of migraine is still controversial and gaps in our understanding remain. Accompanying symptoms such as phonophobia, photophobia, nausea, vomiting, dizziness and blurred vision, as well as autonomic phenomena of conjunctival injection, lacrimation and lid edema are common and individual. It is manageable, see a headache specialist or orofacial pain.