Eliminating Histamines can help reduce symptoms (bloat, respiratory issues, sinus congestion, allergies, excess phlegm etc.)
Sometimes even lemon water!!! ( citrus fruits are not themselves considered high in histamine, but can trigger your body to release stored histamine ). Observe if oranges, grapefruit, or any other citrus cause problems.
Left-overs are another often missed histamine trigger. Think about any foods that are aged (spices, cheeses, ferments etc.)
Also, many ingredients in processed foods: desserts, conventional baking, preservatives, and additives often trigger histamine reactions.
Gut imbalances, stomach, and digestive issues highly correlate to those who have histamine sensitivities/intolerances.
Check out these resources by clicking the images in this post.