My husband dad p away 6 years ago due to heat attack. My husband still is shaken by it?

You mean "heart attack". Your husband still needs time to grieve. He lost his father. Time will eventually heal this pain. Tell your husband that his father is looking down on him and he should do him proud. It is unfortunate the way his father died. But, it is not his fault. His father knows that and does not blame him. We do not have control over everything. He needs to ease up on his guilt before it destroys him. It has been 6 years. He needs professional counseling to work through his issues and talk about his feelings. It is sometimes helpful talking to a 3d party that is not involved. Look into low-cost mental health counseling agencies or non-profit or community centers that have grief counseling or therapy groups. I can see why you are worried. Be there for him with support and compion. Good luck.