A low histamine diet may help ease the symptoms. You should talk to your doctor about the symptoms.
Histamine can start to be produced in foods when they start spoiling, because of certain bacteria. The biggest source is an animal food source. Animal-derived food sources can be contaminated with bacteria after seat for a while. Fermented foods can also be a big source of histamines. We can say the worse source will be meat and fish, special if not supper fresh.
Some fruits and vegetables like citrus, bananas prunes, strawberries, raspberries, papaya, mushrooms. spinach, pears, kiwi, eggplant, avocado, canned vegetables, and prepared salads can also be very high in histamines.
Cheese can also be a big source of it.
It is very important to USE HIGH-QUALITY FRESH FOODS or fresh frozen and well inspected, to make sure there are no molds, bacteria, or fungus that will cause a histamine reaction.