It sounds distressing to experience anxiety, restlessness, and sudden fear of dying despite normal brain and heart tests. These symptoms are often linked to anxiety disorders or panic attacks, which can cause intense fear and physical symptoms without underlying structural brain or heart problems.

🩺 Possible Causes

• Panic disorder or anxiety disorder: Sudden episodes of intense fear with physical symptoms like restlessness and fear of dying are common in panic attacks.
• Stress or psychological factors: High stress or unresolved emotional issues can trigger these symptoms.
• Other medical causes are less likely given your normal MRI, CT scan, ECG (electrocardiogram), and echocardiogram results.

🩺 What You Can Do

• Consider consulting a psychiatrist or clinical psychologist for evaluation and management of anxiety or panic disorder.
• Cognitive-behavioral therapy (CBT) and/or medications can be effective treatments.
• Practice relaxation techniques such as deep breathing, mindfulness, or gentle exercise to help reduce symptoms.

⚠️ When to Seek Urgent Care

• If you experience chest pain, severe shortness of breath, fainting, or neurological symptoms like weakness or vision changes, seek emergency care immediately.

Seeing a mental health specialist can help identify the cause and provide appropriate treatment to improve your quality of life. If you want, I can explain more about anxiety and panic disorders.To narrow down potential causes, we will need some more information.Please tell me your age and gender. I understand you're feeling anxious and restless, with a sudden fear of dying, even after normal results from brain MRI, CT scan, ECG, and echocardiogram.