Get training for managers and other leaders in the human aspects of change. During times of crisis, those numbers should reverse until routine is established again. Most technical managers will need human resources training and support. Way over communicate everything. When things seem to be coming apart, the normal communication links break down just as suspicion and mistrust begin to predominate.
Some news is always better than no news, even if it is the same old news.
If people don't hear anything, they fear the news is so bad that no one wants to tell them. Bore them to tears with as much detail as often as possible. Trust will build. Be honest about the realities and future expectations. It is not uncommon for a series of changes to occur during the process of readjustment.