Just focus on that one, Strat- the appointment- and let the rest fall away. It sounds like you're at a point where there's nothing to lose and that can be a very freeing moment. Just try to let it all go...the fear, the anxiety, the pain, etc. Just give it away. Keep yourself open to whatever presents itself.
Again, nothing to lose. If the shrink is mean or they can't help you'll be no worse off for it. But if they can help you could turn around all the misery and move towards a life that's worthwhile and meaningful to you.