Certainly, this sadness is how we let go, but hopefully it's not all sad, and our lives aren't pervaded by total sadness. Hopefully, there is some joy in your life, and in the living of this person who may be dying in the future, but is living here today. So, hopefully there is joy in some of the things that you are doing together. It's the just common kinds of responses to grieving. People are certainly aware of the sadness and the depression that often comes with grieving, and the loss of someone that you cared about so very, very much.
Anxiety is very common.
When someone close to you dies, you realize that we're all vulnerable, that we all might die, and you see it around you when you're driving down the road and you see it more, and people become extremely anxious. That's something that people don't know. The other thing that people recognize often, is that they get angry. They may get irritable. But it can be that you're really sorrowful that this person has died, and you're angry with them for leaving you.