Having have several major depressions in my life, I've had to learn which things to face and which to avoid. A negative emotion can be an indicator of a need, for instance is a fear is realistic it indicates a need to take action to ensure safety, but if it is unrealistic, say, a conditioned reaction from something in the past with no bearing on the present, then it requires a different response, such as deep breathing and self comfort and self reassurance. I did find that during those times it was good for me to avoid documentaries about sad or difficult matters, and to avoid dwelling on things that pulled me further down hill. I discovered that balance is an extremely useful thing. If too much of something, leave it for a while and attend to something positive or useful.
Depends a lot on my mood, and the emotions the particular question make me feel in the moment I read it. I think most of all I am feeling the sadness that might be behind the question, and my sadness is addressed to the person asking their question.
Not at all. Serious and sometimes depressing subject matter actually makes me feel more reflective. I don't mind sharing some of my experiences, especially if it helps just one person not feel so alone.