I'm very sorry to hear you're back in the depression. It seems so cruel doesn't it, to be doing so well and then for seemingly no reason slip back into that black hole. Just remember you can climb out of it, you've done it before and can do it again.
Perhaps if a therapist isn't available to you right now you could try self help? A good self help book is kind of the same as therapy anyway, except you can't talk back to it. All of the methods and stuff are the same though. I do find sometimes they can help so maybe it's an option for you, if you feel up to it.