My heart just breaks for all of the kids, no child should have to go thru what they do. My son also has PANDAS and has had it for years, but finally had it diagnosed last May 2011. He had to be on steroids for two months and was about 80% symptom free for the first time in years....but then in June he got strep. Everything has gone down hill since then and nothing is working. He has tourettes/tics and OCD. He has itching in his legs, which causes him to have to kick his legs when he is walking or drag the tops of his feet because he says they itch. His neurologist said it is either a complicated tic or OCD, but there is no way to know which it is. This is knew since he got strep in June and is just getting worse and worse. He also has facial tics and severe stuttering, to the point that sometimes he can't talk.
One thing that we did find out with my son, he had fifths disease within the last month. Some information I found said it can cause a flare with PANDAS kids just like strep. It is a viral infection, but it can cause inflammation in the body and in rare cases can causes encephalitis or arthritis. It can also cause a rash anywhere on the body that can come and go for weeks. The rash is a lacy red blotchy rash, that doesn't usually itch. My son did not get the rash or have any real symptoms of being sick, but my daughter did. My sons bloodwork showed he had/ has it recently which could explain the severity of his symptoms.
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Has your son started getting better yet from the IVIG? We are trying to get IVIG covered by our insurance and will hopefully be doing it in two weeks. But, hearing how your sons is doing after the IVIG is scary. This feels like the last hope. Which doctor are you seeing in WA? We are in OR, but travel to see a wonderful Dr in Redmond,WA.