This book has been a godsend for my chronic pain problems, including, somewhat surprisingly, neurological stuff: https://www.amazon.com/Trigger-Point-Therapy-Workbook-Self-T... (I suggest looking up "whiplash" in the index.) As weird as it sounds, when I massage the muscles around my head and neck, I get noticeable cognitive changes in the minutes and days that follow.
It was recommended to me by my PT when I had hand pain, and it's helped me not only with that but back pain, headaches, and plantar fasciitis. Probably a few more, too. If you ask me, it's the best $16 investment you can imagine.