You don't have a "histamine intolerance".
Your body is simply responding to a pathogen or poison.
Here is a short list...
Brain fog, inability to focus, sleepiness, cranial pressure.
Bloating, pressure, increased gastric secretion.
Mucus, tiredness, hives, reduction in oxygen to brain.
Can you tell the difference between histamine and inflammation?
They go hand in hand, so to speak