Empty chest feeling causing depression?

I don't think its a brain tumor. I would look in to numbing though. With numbing nothing really matters, and that bad in the world isn't really surprising. With you also don't feel many emotions, you may feel emotions on a few instances but as hole they are absent. You can get better with therapy. Most doctors would want therapy first before going on to any medicine. And you can always decline to take medicine. I hope you get better! I've put a link to article about numbing below =]