Thank you for sharing this challenging but puzzling patient. Unfortunately, I am not going to be able to give you any definitive opinion, and I, like you, failed to find any reference to either compound in regards to the production of anaphylaxis or any evidence for IgE-mediated reactions to these agents. Even searching the Material Safety Data Sheets (MSDS) for these compounds showed no evidence that they could produce symptoms such as described in your patient. We do know that exposure to volatile organic compounds can clearly produce respiratory symptoms (see reference and link to this reference below), but as best I can tell, but as best I can tell there is no recorded evidence that exposure to these agents cause IgE mediated events or anaphylactic episodes. Thus any suggestion I give you would not be based upon the literature, but rather opinion/experience-derived.
Since he has been evaluated for neurologic and cardiac causes of his syncopal episodes, I would at least suggest, if you have not ordered it, a baseline serum tryptase, and give the patient instructions that, should another episode occur, a serum tryptase during the episode and perhaps a 24-hour urinary histamine determination should be done. It is doubtful that he does have mastocytosis, but as you know, there are a number of cases reported in the literature where patients have presented with syncope and later found to have mastocytosis (see references below). Thus, for the sake of completeness, at least a serum tryptase should be done.
In direct answer to your question, there is no known precedent, to my knowledge and according to a literature search, for an anaphylactic reaction due to exposure to moth balls. This of course does not rule out this possibility, and therefore I believe you should at least proceed, if you have not done so, by obtaining a baseline serum tryptase and trying to assure that should another reaction occur, a tryptase and 24-hour urinary histamine be obtained at that time.
Thank you again for your inquiry and we hope this response is helpful to you.
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