I seem to have a reaction to almost everything I eat. Headache, tingling, numbness, nausea, dizziness, foggy headed, etc.?

See a doctor. Have you seen a doctor for this? It is unusual that it would be "everything" you eat. I might keep a careful diary of timing of these symptoms and explore why you feel like it is related to food. There are a few things like "reactive hypoglycemia", which can occur hours after eating so the timing and consistency of what you are experiencing may be helpful to your doctor.
Not sure. Food reactions could be the cause. I suggest seeing a doctor to discuss your symptoms. Keep a food and symptom diary. We may be able to link a single ingredient such as nuts. Soy or wheat.