@cmg have you done any BPPV exercises with a PT? You can do them yourself at home too. Soometimes a concussion knocks the crystals out of place in your ear.

At home, sit on the edge of the bed, looking straight ahead for 30 secons. Turn your head to the right and fall quickly on your left side (speed is important). Your face will be toward the ceiling. Stay there at least 30 seconds and basically until dizziness stop. Quickly return to sitting and looking straight ahead and again 30 seconds or until the dizziness stops. Repeat on the other side.

You can have BPPV on one or both sides and whatever side(s) cause dizziness in this maneuver is/are the side(s) where the crystals are dislodged.

If you have BPPV and do these exercises, you may feel worse for a bit but it works rapidly. Of course dizziness can be in the brain and this won't help. Going to a PT who can evaluate cause is the best course because they can train you on maneuvers but also let you know if they are appropriate.