The one I'm specifically interested in is Wheat Bread. I've searched all kinds of ways and can't seem to find Behr LRV values.
The general outline of this therapy can be found here: Best natural cough treatment. This is the way how you can stop coughing for good. An additional factor to stop coughing naturally is to use Earthing for grounding the human body to get Earth's electrons to reduce inflammation.
No coughing is not going to stop a heart attack (myocardial infarction). However, if someone's heart is beating abnormally, sometimes forceful coughing may help. These abnormal beats are caused by many things only one of which is a heart attack.