Had Vertigo Episode While In A Pilates Class. Was Fine

Had vertigo episode while in a Pilates class. Was fine for 1 1/2 days had another episode when getting up quickly. Since then generalized dizziness not vertigo and heaviness in my head. Sorest of like a swimming sensation. I had this 5 years ago did the epkey maneuver several years iMessage and seemed to be fine after a couple weeks but knew my left side was my bad side so for past 5 years have slept on my back or right side. This seems different. Don't have a good side. Tried exercise and got dizzy both ways It's been over a month. I'm am audiologist so inknowxaboutbthe balance system. My head feels clogged. Anyway I'm going for an MRI next Thursday. What should I be concerned about or be aware of do make it better