Hi Eskie. Just curious if your name refers to the dog breed, as seen in my avatar?
Anyhow, a lot of what you said rings true for me. The longer I go without feeling down or overwhelmed, the more I'll obsess over the fact that I am not. Small things can then set me off (though I can obsess on some pretty big things too). Then, after dealing with this for a while, a few days of numbness sets in (which I consider relief, really), and then the cycle starts over. Sometimes I'll read very sad or tragic stories from others, just so I don't feel alone in my suffering. That's actually how I first found these forums.
So no, you most certainly aren't alone in this kind of thing. I hope you can find a little bit of an outlet by being here. This seems like a perfectly fine sub-forum to talk about it in, if you'd like. You're welcome to say as much or as little as you feel like.