I have been getting nauseous and throwing up for months now. only at night.just most nights but not every night. what could this be? get migraines alo

See your neurologist: If your migraines are not under control, then you should keep a log of the location, timing, duration, and intensity of these episodes and take the log with you to a neurologist. If your migraines are controlled then other causes for vomiting include hypertension, intracranial mass, metabolic disorder, medications, etc. https://www.aan.com/Guidelines/Home/ByTopic?topicId=16