I suspect histamine intolerance since a low-histamine diet has vastly improved my "viral-induced asthmatic bronchitis" (diagnosis), and any slip-ups can make me sick for 2-3 days easily. I'm talking a slice of tomato on a sandwich. A high-histamine meal can put me out for more than 2 weeks. Tomorrow I am going to get a brain scan (due to an abnormal ACTH stimulation test, loss of sex hormone, and thyroid malfunction - I'm wondering if it's panhypopituitarism). My doc ordered an MRI with and without contrast. I noticed in http://ajcn.nutrition.org/content/85/5/1185.full.pdf html that "contrast media" was the first entry in table 5, "Drugs releasing histamine or inhibiting diamine oxidase". And in Table 2, the first entry is "Radiological Contrast Media" in www.data.aerzteblatt.org/pdf/DI/103/51/a3477e.pdf I will talk to the tech (and bring the articles). I also plan to take some benedryl before the test and have with me my albuterol inhaler, afrin nasal spray, and prednisone, just in case. (My intolerance presents mostly as nasal blockage, asthma-like chest tightness and reduction in respiratory volume, and headache with swelling and tenderness along the skull seams on the left side of my head that can last weeks.) Has anyone else with histamine intolerance had to have contrast media? What have you done to prepare and how well did it work? I'm going to check this about 1 pm Mountain Standard Time (US), before I go. I thank you in advance for your input!!!