Really important stuff. Man, Raganwald, thanks so much for this blog post.
I think one important thing for anyone who's struggling to remember is that however you're feeling, it's not permanent. It's temporary. It will change. It might feel like things are never going to get better, but they will. It might feel like you're never going to feel better, but you will. You just have to hold tight to that fact, and trust it, even if it seems impossible. Then, six months or a year or three years from now, you'll be so glad that you hung on.
I recently learned that a former student of mine committed suicide, and I think about him all the time. I wish I could have told him all this while he was alive.