The shock of sudden change can make it hard for employees to prioritise, make decisions, and concentrate on work. Do only one thing at a time, stick to basics, break complex jobs into smaller tasks, and make to-do lists. Once the initial shock wears off, people cope by acting as if nothing happened. Avoidance doesn't work. Talk to employees, and help them face the reality of the change.
Employees feel powerless, question their roles within the organisation, and sometimes get depressed.
Ask people who have undergone similar experiences to talk to your employees. It will help them realise that they're not alone and that other people have gone through the same ordeal and survived. Help employees acknowledge their losses, making sure to listen when they do. Afterwards, they can let go and move on. Once they let go, employees can then get comfortable with the new environment created by the change.