I would stop communicating. No more read/reply for emails or messages. No phone calls. No writing or reading of memos or other documents. No creating presentations, diagrams, or drawings.

On the other hand, it is really hard to stop thinking about work, and maybe not necessary or advantageous. Most of the really good ideas that I've had came to me while I was not working. Your subconscious can be working even while you are doing other things.