Fexofenadine
Now let me tell you that out of all the oral anti-histamines, Fexofenadine is the only that has no LACTOSE in its excipients which is why it is the BEST cortisone-free treatment for hayhever and other allergies and intolerances.
ALWAYS read the excipients because if there is the any lactose, it negates the cure!
I have been to a several World-leading specialists on the subject and for severe chronic cases, Omalizumab, which is an immunomodulating (IMiD) monoclonal antibody (mAb) therapy is now regarded as the standard.
But again we are attacking symptoms and not the causes and the best way out this mess is via homeopathy and updating one's emotional map.
If you really are disciplined enough, an histamine-free regimen will reset all your cells so that your software (mind) reconnects with your hardware (body).
Just look at Djokovic!