That's an interesting list. I really wish number 9 was true. Then I also haven't found vitamin C or quercetin to be of help as antihistamines either.
If quercetin is not working for you then the problem may not be histamine. If you are referring to asthma then the problem could be with leukotrienes instead. Leukotrienes are 1000 times more powerful in inducing asthma than histamine.