I have never had a panic attack, but I get crying, sobbing anxiety/depression attacks. It is painful. It's a type of pain that is nearly impossible to describe. It's like your brain is betraying you. This article talks about hiding anxiety; they say that bottling it up makes it worse. Does it work for depression?
The feelings may be different with depression, but there are some similar qualities. Most of us will hide it when we are in public. If you say, "How are you?" We will say something simple, such as "fine."
We may take extra time trying to not "look depressed." Depression is not just sadness. It can cause numb feelings, worthlessness, hopelessness, and others.
These thought that seem foreign keep floating around in your brain. It's like the static on a radio. We just have to fight it and try not to listen when depression wants to take us down.
There are physical effects with it as well: exhaustion, irritability, tearfulness, and others.