You may have already found the low-histamine & tyramine diet recommended for people with mast cell disorders and others, but here it is:
http://www.mastocytosis.ca/MSC%20HT%20Restricted%20Diet%20Nov2012.pdf
Note that it's a good starting point. Most people find they have to customize their diet to look a lot like this one plus a few adjustments...
Passover wines are grain free.
Keep in mind that intestinal mastocytosis is commonly accompanied by other gastrointestinal conditions. One common symptom of mastocytosis is intolerance to alcohol.
For the people who are having similar symptoms from corn as wheat/barley/rye gluten, there appears to be no coincidence. While the chemical make up of each grain differs, our bodies' responses do not. Thus, we insist that a connection must be made and/or there needs to be more categories to the condition. I think we've safely concluded on this forum that...
It's not totally an urban myth, some Celiacs are also intolerant to corn--in any form. I don't think it's a coincidence. My corn intolerance is worse than the Celiac since I have anaphylaxis even if a food has potassium citrate as an additive. I can't touch a cola or anything else with caramel color with a ten-foot pole.