Heart failure and heart attack are both forms of heart disease. They have some common causes. But they also differ in key ways. Most heart attacks happen suddenly when one of the arteries leading to the heart becomes blocked and cuts off the blood flow.
The action you should take is to do what you can to help her by squeezing her belly to get the stuff out of her throat or call a neighbor even though I don't think there is time for that.
Situational depression is a type of adjustment disorder. It can make it hard for you to adjust to your everyday life following a traumatic event. It’s also known as reactive depression.