The ammonia issue in this thread needs a bit rethinking, because molybdenum actually has something to do with it too, although not clearly stated anywhere, it also takes part in removing harmful nitrogen compounds. And brain fog, nearly everyone has it in amalgam illness.

Here are some symptoms of ammonia poisoning (took away those symptoms that are clearly caused by exposure coming from outside of your body):

Lungs and chest
o Cough
o Chest pain (severe)
o Tight chest
o Wheezing
Eyes, ears, nose, mouth, and throat
o Throat pain (severe)
o Mouth pain
o Lip swelling
Gastrointestinal
o Severe stomach pain
o Vomiting
Skin
o Bluish colored lips and fingernails
Heart and blood
o Rapid, weak pulse
o Collapse
Nervous system
o Restlessness

Brain fog seems to be absent from this list.