Thank you for pointing out what should be obvious to me. I tend to tiptoe around doctors because they are so crictical of everything we do. We had her evaluated for autism at age 5 and were given 10 different diagnoses that were not on the spectrum. We couldn't get any therapy for her because the pscyhologists inisted she had autism. Six months later, the same doctor decided she qualified as PDD-NOS which easily encompassed most of her other diagnoses. Now the social worker is puzzled because she doesn't exactly fit her idea of an autistic child either. Looking back, I can see that everything could fit with PANDAS including the severe enuresis and anorexia. What a revelation!
I think its VERY possible, perhaps probable that the selective mutism and PDD-NOS are also symptoms of the same underlying problem that causes the tics and OCD, rather than separate conditions.