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.
You probably have bronchitis or pneumonia, you should see a doctor. For tonight, you can go in the bathroom, close the door and run the shower REALLY HOT! But don't get in! Stand in there for a few minutes and breathe the vapor, it may help you stop coughing a little bit. Otherwise, try lying on your stomach.