My son was 36 years, hale and healthy. He was working in Dubai and was staying with his wife & a 5 years old daughter. His wife always quarrels with him. He was earning 4 lakhs per month. So no monetary problem. After 3 years of Dubai, he came back to India with a good job, His wife was not interested in coming back to India. A week after coming back to India suddenly within 15 minutes he collapsed and declared dead. What is the reason for this.