Start with high-confidence headaches & migraines books, then narrow by subgenre or adjacent topics.
Mind Your Body
Nicole J. Sachs LCSW, John Stracks MD
Hypothyroidism
Broda Barnes, Broda O. Barnes
End Back Pain Forever
Norman J. Marcus
Bone on Bone
Meredith Warner
The Pain Management Workbook
Rachel Zoffness MS PhD, Mark A. Schumacher MD PhD
Back and Neck Health
Mohamad Bydon M.D., Mohamad Bydon