Generalized Anxiety Disorder (GAD): This is a common condition in the elderly, characterized by excessive worry about everyday things, which is difficult to control. The age and presentation of recurrent anxiety attacks make GAD a plausible diagnosis.

Panic Disorder: Characterized by recurrent panic attacks, which can be similar to anxiety attacks. The key distinction lies in the presence of discrete panic attacks.
Depressive Disorder: Depression can manifest with anxiety symptoms, especially in the elderly. It's essential to consider this diagnosis due to the high comorbidity of depression and anxiety.
Adjustment Disorder with Anxiety: This condition involves anxiety symptoms in response to a significant life change or stressor, which is common in the elderly due to life transitions.

Cardiac Conditions (e.g., Myocardial Infarction, Arrhythmias): Chest pain or discomfort and shortness of breath can be mistaken for anxiety attacks. Missing a cardiac condition can be fatal.
Thyroid Disorders (e.g., Hyperthyroidism): Symptoms of hyperthyroidism, such as palpitations, tremors, and anxiety, can mimic anxiety attacks.
Neurological Conditions (e.g., Transient Ischemic Attacks, Seizures): Certain neurological conditions can present with symptoms that resemble anxiety attacks, such as sudden onset of fear or altered mental status.

Pheochromocytoma: A rare tumor of the adrenal gland that can cause episodic hypertension, palpitations, and anxiety-like symptoms.
Hypoglycemia: Low blood sugar can cause symptoms of anxiety, tremors, and palpitations, especially in diabetic patients.
Vitamin B12 Deficiency: Can cause neurological and psychiatric symptoms, including anxiety, which is more common in the elderly due to decreased absorption and dietary intake.