Hi, backandforth...
You and sj both advised against "masks." I tend to be on the opposite side of the invisible line - I tend to be too open and, especially my good friends, know what my mood is at any given time. I have to work on that.
So, my question was more to the point on how you get by day by day without others knowing the pain you're (generic) in. You're probably right, though, that keeps the pain inside.
I apologize for any confusion my question may have caused, it was not intentional.