A 40-year-old woman presents with persistent, non-spinning dizziness and unsteadiness for the past two months. She has been under significant stress at work and has been having difficulty sleeping. Physical exam and basic lab tests are normal. What could be the potential cause and the next step?
This patient's persistent non-spinning dizziness, along with her ongoing stress and sleep problems, suggest a diagnosis of persistent postural-perceptual dizziness (PPPD), a functional neurological disorder. Further evaluation should include a detailed neurological examination and potentially psychological evaluation. Treatment typically involves cognitive-behavioral therapy and physical therapy.