My son’s case was severe. We were in a very dark place multiple times, sometimes lasting over a year at a time. Looking back, I don’t know how we survived. What kept us going were those times of reprieve, like you experienced after your tonsillectomy...showing that there is an answer out there...but just needing to figure out how to sustain it. My son responded well to tonsillectomy, antibiotics, NAC, IVIG, but nothing with complete and lasting results. He is now receiving monthly HD IVIG at least until the end of the year. His tics have been gone for the most part for over a year. His OCD improved somewhat after 1st IVIG, but it wasn’t lasting (that is why I recommended testing for Mycoplasma Pneumonia first). His OCD is about 85-90% improved, but he still has major sensitivity to sound and odors, still has anxiety and focus issues. He just started an herbal antiviral and an herbal antibacterial. We plan on trying either the Paleo or Ketogenic diet soon. Watch the documentary “The Magic Pill” (currently on Netflix). It is amazing the impact diet has on physical and mental health. Also, Joe Rogan has a regular guest on his podcast, Chris Kresser. He promotes the Paleo diet and once used a specific example of a child with PANDAS symptoms (although he didn’t call it PANDAS) that was cured using the Paleo diet.