Anxiety or Stress-related Symptoms: Given the symptoms of ear fluttering and eye twitching without active migraines, and considering the patient's history of migraines, it's plausible that the patient is experiencing anxiety or stress, which can exacerbate or mimic migraine symptoms without an actual migraine episode.

Migraine Variant or Prodrome: The patient's history of migraines and current symptoms could indicate a migraine variant or the prodrome phase of a migraine, where patients may experience non-specific symptoms before the headache phase.
Essential Blepharospasm: Characterized by involuntary blinking or spasms of the eyelids, this condition could explain the eye twitching, though it doesn't directly account for ear fluttering.
Benign Essential Tremor: While more commonly associated with hand tremors, some forms of essential tremor can affect other parts of the body, potentially leading to symptoms like ear fluttering or eye twitching.

Thyroid Dysfunction: Both hyperthyroidism and hypothyroidism can cause a range of symptoms including tremors, muscle twitching, and potentially could be associated with the described symptoms. Missing a diagnosis of thyroid dysfunction could lead to significant morbidity if left untreated.
Multiple Sclerosis: Although less likely, multiple sclerosis (MS) can present with a wide variety of neurological symptoms, including tremors and spasms. MS is a diagnosis that would be critical not to miss due to its significant impact on quality of life and the availability of disease-modifying treatments.
Vitamin Deficiencies (e.g., Magnesium, Vitamin B12): Deficiencies in certain vitamins and minerals can lead to neurological symptoms including tremors and twitching. These are important to diagnose as they are treatable and can significantly improve quality of life.

Hemifacial Spasm: A rare neurological disorder characterized by irregular, involuntary muscle contractions on one side of the face, which could potentially explain the eye twitching.
Palatal Myoclonus: Involves rapid, rhythmic contractions of the muscles in the palate, which could be perceived as ear fluttering, though it's a rare condition.
Superior Canal Dehiscence: A rare condition of the inner ear that can cause a variety of auditory and balance-related symptoms, potentially including a sensation of ear fluttering, though it's less directly related to the other symptoms described.