The book: Grain Brain by Dr. David Perlmutter and Kristin Loberg

Here's some more info on wheat and gluten:
Non-celiac gluten sensitivity is a form of gluten intolerance that may cause headaches, depression, anxiety, brain fog, fatigue, pain, and digestive problems.

Gluten and wheat sensitivity can also cause inflamed lymph nodes which mine definitely became as you can see on my neck on each side under my jaw.