I am 60 years old, three months ago I fell down on an icy floor, having a concussion. I had dizziness, fatigue, headaches... I did physical therapy for positive BPPV. Today I woke up with a strong spinning, lasting 1 minute and nauseated. I have it mostly when rising, lying down and rolling over in bed. My physical therapist did the nystagmus test with the chanalth repositioning maneuver, it didn t show positive. But I had ocular nystagmus from the vibration of the neck. She was not sure why. This is really frustrating...... Can I have some light on this?