If you really need to take the anti-histimines go right ahead, it won't add a lot of toxins to your liver. Now that you've flushed and all it can handle it.

Be sure to step up your Vitamin C intake. It helps tissues to heal faster and in some people reduces the histimine reaction. Ester C is a good C to take, about 500 mg at a time, up to 4x a day.

if the allergies are pollen type allergies, one of the best ways to get your body to recognize that these are okay is to eat honey from local bee farmers. This introduces a bit of pollen into your body in such a way that the body recognizes it as food rather than a baddie, and the immune system can then relearn it to be okay.