As others have suggested, you should consult an otolaryngologist (ear, nose, and throat specialist). You might be experiencing benign paroxysmal positional vertigo (BPPV). This condition is often triggered by specific head movements, which can vary from person to person—for me, it happens when I tilt my head down and to the left.
The good news is that BPPV is highly treatable. I've been managing it for over 40 years, and there's an effective technique called the Epley maneuver. With some practice, you can perform it yourself or with the assistance of your spouse. It’s straightforward and can provide significant relief.
An otolaryngologist can easily diagnose BPPV, so it’s worth scheduling an appointment.