Benign Paroxysmal Positional Vertigo (BPPV): This condition is a common cause of dizziness, especially in young adults. It is characterized by brief, episodic vertigo triggered by specific head movements. The symptoms can last for weeks, making it a plausible explanation for the patient's week-long dizziness.

Vestibular Migraine: Although often associated with headaches, vestibular migraines can present with isolated vertigo or dizziness. The duration can vary, and some patients may experience prolonged symptoms.
Anxiety or Panic Disorder: Anxiety and panic disorders are common in young adults and can manifest with dizziness or lightheadedness as a primary symptom.
Inner Ear Infection (Labyrinthitis): This condition can cause dizziness, vertigo, and sometimes hearing loss. It's more likely if the patient has had a recent viral infection.

Stroke or Transient Ischemic Attack (TIA): Although less common in young adults, stroke or TIA can present with sudden onset of dizziness or vertigo. It's crucial to rule out these conditions due to their severe consequences.
Multiple Sclerosis: This autoimmune disease can cause a wide range of neurological symptoms, including dizziness or vertigo, especially if the central nervous system is involved.
Cardiac Arrhythmias: Certain heart rhythm disorders can lead to dizziness or lightheadedness due to inadequate blood flow to the brain.

Meniere's Disease: Characterized by a group of symptoms including vertigo, tinnitus, hearing loss, and ear fullness, Meniere's disease is less common and typically affects older adults.
Acoustic Neuroma: A rare, benign tumor on the nerve connecting the inner ear to the brain, which can cause dizziness, vertigo, and hearing loss.
Mal de Debarquement Syndrome: A rare condition that occurs after a period of exposure to motion (like a boat ride), causing persistent dizziness or vertigo.