You don't go to the therapist for the therapist's sake...you go for YOURSELF. There is no letting her down if you aren't coping as well as you have previously. Life has it's ups and downs, whether we are functioning normally or are ill. The road to better health is never smooth. Your therapist WILL be understanding. You can talk about how you haven't been doing as much when you see her. You may have identified already what is causing it--you say you are overwhelmed with the "tough stuff" you have been working on in therapy. Maybe pick just one thing off your "should do" or "to do" lists and do one thing, so you at least feel like you've accomplished something. If you're not up even to that, then take a little time relaxing, trying to put thoughts out of your mind; just be at peace with yourself for a few minutes. If you do this a lot, just focus on breathing in and out, you will find you are much calmer and more peaceful. You may get more of your energy back to do some things you'd like. Don't worry--it WILL get better, with all the work that you are doing.