Hi, I have just read this article and I am excited.
http://blog.taragana.com/n/vitamin-b9-good-for-treating-allergies-asthma-49049/

Vitamin B9 or folic acid (folate the active form) could be the cure. I will try it after I have ruled out Evening primrose oil, eucalyptus oil, and Nigellin seed

Will let you guys know.