Constant dizziness/imbalance

The symptoms of PPPD are what I have.
I've been going through this a long time. I get vertigo with nystagmus seasonally usually in connection to allergies spring and fall. Just went through PT from early October to the end of November. The eye exercises fixed the nystagmus but, not what I thought was vertigo. Early on in my PT the movements of people, animals or things around me would make it really bad. I had all the vestibular testing which after having gone through PT were normal.
So, both my Primary doctor and the ENT referred me to neurologist. The neurologist suggested I do an exercise where I roll over in bed from the head of the bed to the foot a couple times a day, the next day do the same exercise in the opposite direction. He also ordered an MRI of my brain w and w/out contrast. I had that done on Friday and the report posted Friday night. Something in the report cause my Primary to ask when my next Neuro appt is scheduled. Whenever I push her for results, she didn't order she usually refers me to discuss with the ordering doctor. From what I understand of that report there is no tumor but, some other possible diagnosis. I guess I will find out at my appointment since there is no acute (urgent) findings, I'll just have to wait it out. In the meantime, I will add PPPD to my list of questions for the neurologist. Thank you for this comment and I will be looking up as much information as I can to take with me a long with questions regarding it to the neurologist.