Many years after posting, I'm checking through old accounts and thought this deserved a reply to give others hope. I notice that I had deleted my messages, but I just want to say that the very typical and rather full-on symptoms typically associate with PANDAS (OCD, inability to speak, eventual inability to walk) eventually went away, but it took a couple of years. He is absolutely fine now and I see this as fitting into how PANDAs can impact some children at a very specific time in their lives.
The parents didn't ever get much help. 'Social services' for a while thought that he may have been mistreated (something I knew wasn't the case).. then the doctors switched to a diagnosis of Chronic Fatigue and never shifted from that. It really did appear to match PANDAS though and now he's fine and thriving and it all seems like a nightmare or a dream of old. It's in the past. I hope that others here, feeling desperate due to the condition and lack of help, reach the same place. Thanks.