Hi Sidney and Jim,
Since its identification 25 years ago, idiopathic anaphylaxis has been classified and treated successfully. The observation that idiopathic anaphylaxis is a steroid-responsive disease has led to recent investigations into a possible autoimmune etiology. Known causes of anaphylaxis that must be considered in every patient with a possible diagnosis of idiopathic disease include food, medications, insect stings, latex, radiographic contrast media, and exercise. Your doctors have prescribed the most current treatment/preventive measures for this allusive problem. The person must be sensatized to an allergen before an allergic response occurs in a patient. This may be the case with your husband eating tomatoes, soy, peanuts, and shellfish. His body became sensative to these foods after weeks, months or even years of ingesting them before becoming allergic to them. He should be tested for latex (gloves) and discuss everything that he experiences before an attach: The foods he eats, what he was doing, where he was, etc. I hope this has been helpful.
Sidney and Jim,
I wish I could give you the answer you are looking for, but unfortunately, it doesn't exist at this time. There is no "test" that will make the diagnosis. It is a diagnosis of exclusion. This means that all other causes for anaphylaxis are excluded such as food allergies, asthma, etc. I realize your are concerned that he will have a fatal attack. He must keep the epipen and other meds with him and avoid all of the possible triggers.