I can say with certainty that PANDAS exists. I don't want to give too many details here, but at 5 years old, I was part of the 1996 study on PANDAS at the NIMH. I was given IVIG on several occasions, and I took an antibiotic three times a day for years. I used to call it 'bubble gum medicine' because of the artificial flavoring (from when I took it in liquid form before I was comfortable swallowing pills). I can't express my gratitude enough for the doctors / study- my life was changed when I got strep / PANDAS, but it was changed again through the treatment that NIMH provided at the time.