The first step would be to get an official diagnosis for Vestibular Migraine. This means the doc has ruled out all the usual suspects. You will need to see both ENT and a Neurologist.
If it confirmed you have MAV you can start trialing meds. Most people find one that works for them. Are you on any meds currently ? Amitriptyline/Nortriptyline are usually first line meds for migraine and depends on your Neurologist and other conditions you might have.
Stick to the migraine diet(See migraine survival guide) and start the supplements (Magneisum, Coq10, Vitamin B2) in the meantime when the above doctor visits and med trials are happening.
Go for long walks and keep moving. I have found long walks give me my sanity even if momentarily.
You will get better and get to a spot where your symptoms are manageable. You will came out of this stronger than you went in. You will be a great mum.