vaccination is not the solution, it may be the culprit. Here's a link with all the information you need on how to treat whooping cough. Read from beginning to end.
Also forget about macrobiotic diet. That diet is full of grains which is highly acidic. He needs as much fresh vitamin C as possible.
The foods he should be eating, pineapples, grapefruit, camu camu powder has a lot of vitamin C
Absolutely no dairy products
And yes organic chicken soup or organic fish soup made with a whole fish.
put chopped garlic cloves, and green onions in his organic omega 3 eggs or pasture raised eggs. sprinkle kelp for Iodine on his eggs. http://www.whale.to/a/The-Vitamin-C-Treatment-of-Whooping-Cough.pdf