Our expert says:
Yes, the paediarician may hav some useful ideas.
That he HAS managed even a 2-week period of sleeping through the night, establishes that he CAN do so. He is still probably picking up on the stress between you adults, and feeling more insecure insecure than usual. Keep telling him that you will always be there for him, even, and maybe especially, during the night. Let him come through, if he must, to check that you're there. Then having established that fact, take him gently but firmly back to his own bed. The first time you explain, that as he saw, you're still there, and trying to get your own sleeping done, and he needs to sleep well in his own bed. On any subsequent visits, just take him calmly back, without further discussion let alone argument. At first it seems as though he will never get the idea, but eventually they generally do.
And urgently work with proper counselling to sort out your relationship issues, which are probably the root cause of his feeling so insecure.
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