Hello! Brain tumors, meningioma is one of them, can cause often headache, dizziness accompanied by nausea and vomiting because of the increased intracranial pressure and thepainful structure tractions (like vessels and meninges). When these symptoms are caused by the tumor they tend to be more present in the morning, during body position changes. These symptoms can be connected even with the location and size of the tumor. If it is developed in posterior fossa, near the cerebellum, or the pontocerebellar angle dizziness and vertigo can be more evident. If the tumor is located where it blocks the spinocerebral liquid circulation headache and nause and vomiting are the most common signs. Regarding the other alternatives, meningioma in general is a benign tumor with a low rate of growth. If the tumor is of big size and has a lot of edema may be you should find away to anticipate your examination. I hope everything goes fine. Kind regards