Sadness means you need love. (From another person, a pet, yourself.) Someone whose presence brings you comfort. May be dead, living, fictional, historical figure, religious (god, saints, Buddha, etc.) Live and in person is best though. Let someone love you how you need to be loved.
Kindness is key. Practice being kind even when you don't feel like it. Let's all encourage each other to be kind always. (Or learn how to take a walk or go to our room when we just can't be kind in that moment.)
Change always brings feelings of unease. It’s easy to confuse that feeling of unease with the feeling that something must be wrong. Give yourself time to adjust before deciding if a new thing is bad..
When someone suffers the loss of a loved one, don't shy away. Go to the service. Check in during the months following. Say the name of the person who died when you talk to them. Forward pictures of the loved one if you have any, share stories. There are exceptions to this, so always take your queue from the person who is grieving.