Thanks for sharing this update. So glad to hear the doctor is not at a loss and feels there are several diagnostic actions to take.

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I printed out a lengthy description of what was going on so we didn't have to say too much in front of him
Sounds like an effective plan.

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looping conversations always around to something HE wants to talk about...the repetitive nature of his discussions, perseveration on topics
Possibly your son is a politician! wink