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Dizziness with resulting nausea is often a balance issue. Balance is controlled by a system involving the inner ear communicating with the brain. An otolaryngologist, also known as an ENT (ear, nose, and throat doctor) is the specialist to see to determine if this is the cause of your symptoms. It's highly unlikely that fluctuating hormones would be causing it.
Please let me know if you have questions.
Of course we are unable to diagnose anything online. It sounds like your providers are slowly ruling out possible causes for your symptoms. Sometimes it is very difficult and takes a long time. All of them are right in saying that pineal cyst, hiatal hernia, mild cervical disc abnormalities, etc. cannot cause the symptoms you are having. Although you have seen two ENTs, it still sounds like the problem is vestibular (inner ear). Sometimes a tumor on the vestibular nerve will cause vertigo, but that should have shown up when you had the MRI that discovered the pineal cyst. Normally fluctuating hormones also do not cause dizziness and nausea. An endocrinologist could order a blood draw to check, but it is really a reach.
I'm sorry it isn't possible to diagnose anything online. Your providers can give you medication to help with the nausea while they try to determine what is causing the dizziness.