Natural antihistamines may have some of the effects of medication antihistamines in blocking the action of acetylcholine that may lead to some dizziness.
Histamines are a part of your body's defensive immune response. Blocking this response may make you more vulnerable to whatever toxins are present in the tissues that the body was originally responding to.
I would do the Candida Plan to improve levels of inflammation. candida can cause low levels of HCL that then lead to nutrient deficiencies, such as the iodine needed for proper thyroid function.