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If your dog refuses to come or ignores you, do not repeat the command, leave the room, shut the door, count to 5 and then return. When you return, completely ignore your dog. If your dog now approaches you, bump off and turn away, count to five and then try again with the recall. If when you come back to the room, your dog is not at all bothered, wait until after the next time your dog approaches you or the next time you have been out of the room before trying the recall again.
If your dog is still not eating after a full 24-36 hours then consult a vet. If you have any concerns about this method or your dog's eating habits, you can either consult your vet or contact Alpha of My Pack.
Packs naturally like to stick close by, but only puppies are supervised 24/7. If your dog can't relax when you nip out of the room, then he sees you as his puppy that needs to be watched. Shutting the door behind you regularly will break this habit and allow your dog to relax.