Joan
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If I were in your situation, I'd see an allergist for testing. True IgE allergies are one thing to rule out before a mast cell diagnosis is considered. Atrovent nasal spray is Rx only. An allergist can also prescribe other sprays, too. Another one that could be helpful is Nasalcrom, a mast cell stabilizer for the nose. There are also antihistamine nasal sprays, such as Astelin (comes in generic, Azelastine) and steroid nasal sprays that are not absorbed systemically to a great degree.
It sounds as though you believe your symptoms might be caused by certain foods or food groups, and an allergist can advise you on elimination diets that might be helpful. A nutritionist might be able to help, too. For example, if you tested positive to certain pollens, you might need to avoid some foods that cross-react.
Unfortunately, figuring out food triggers is mostly a process of trial and error if it's not a true allergen. You should be able to eat a variety of healthy foods, even on a low-oxalate, low histamine diet. I briefly looked at a low oxalate food list, and there were only a few foods/drinks that would not be recommended on a low histamine diet. Still, these are only 2 of the many possible elimination diets you can try. When my daughter was having problems, we cut her back to lamb, rice, pears, and yellow vegetables for 10 days, and then started adding foods, one at a time, every other day. It was obvious when we found what was causing her problems, so we eliminated those foods permanently. Starflower posted Dr. Castells' elimination diet, which she found helpful.
It's also important to rotate your diet. Eating only a few foods can be a problem, as having them every day can sometimes cause sensitivities to surface. Dietary deficiencies can develop, too, which can cause more symptoms.
If you're negative to all allergens, food and environmental, then you might want to pursue some other things, like mast cell disorders. I have a mast cell disorder and IgE allergies, and there are times when I get gustatory rhinitis. The Atrovent and eating a "gentler" diet usually takes care of the problem within a day or two.
I hope you can figure this out soon!
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