Migraine: This condition is often triggered by visual stimuli, including bright or flickering lights, and can cause dizziness and headache. The visual triggers can lead to a migraine aura, which may include dizziness, followed by a headache.

Benign Paroxysmal Positional Vertigo (BPPV): Although primarily associated with positional changes, some patients with BPPV may experience dizziness triggered by visual stimuli, including lights. Headache can also be a feature.
Vestibular Migraine: Similar to migraine, but with a stronger emphasis on vertigo and dizziness as primary symptoms, often triggered by visual stimuli.
Photosensitive Epilepsy: In some cases, flashing lights can trigger seizures, which may manifest with symptoms including dizziness and headache.

Transient Ischemic Attack (TIA) or Stroke: Although less common, visual disturbances, including those triggered by lights, can be a symptom of a TIA or stroke, especially if accompanied by other neurological deficits. Prompt recognition is crucial.
Subarachnoid Hemorrhage: Sudden, severe headache (often described as "the worst headache of my life") can be accompanied by dizziness and may be triggered by sudden changes in intracranial pressure, potentially precipitated by straining or other activities, including those involving visual stimuli.
Papilledema: Increased intracranial pressure can cause headache and transient visual disturbances, including those triggered by lights, due to the pressure on the optic disc.

Ocular Migraine: A condition that affects vision, causing auras or other visual disturbances without the headache phase of a migraine. It can be triggered by lights and may cause dizziness.
Visual Snow Syndrome: A rare condition characterized by a continuous, dynamic, small pixelated pattern over the entire visual field, which can be exacerbated by lights and may cause headache and dizziness.
Autonomic Dysfunction: Certain autonomic nervous system disorders can cause dizziness and headache in response to various stimuli, including visual ones.