Thanks for your question on Healthcare Magic.
I can understand your concern.
No need to worry for cardiac 
chest pain as his 
angiography is normal.
Chest Heaviness, chest pain are seen with 
acid reflux also.
So tell him to follow these steps.
1. Avoid large meals, instead take frequent small meals. Avoid hot and spicy food.
2. Avoid stress and tension, be relax and calm.
3. Take 
pantoprazole tablet on empty stomach twice daily.
4. Go for walking after meals. Keep 2-3 pillows under head in bed to prevent reflux.
5. Quit 
smoking and alcohol if he has these habits.
Don't worry, he will be alright with all these.
Hope I have solved your query. I will be happy to help you further. Wishing good health to your husband. Thanks.