I think it IS behavioural, with all the changes he has been through.
Is there a room where he could be isolated for a while? Not FROM everyone, but just restricted to one room with food and box so he doesn't feel overwhelmed by the whole new space?
If that can be your bedroom, then he is closer to you...this kitty needs a TON of reassurance.
Catnapper - and others - have used a psychic called Nancy who is inexpensive and wonderful. You might PM her for the information.
HUGS!
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