Well, if you could, tell me about it. You don't have to though; I only say that so I can more understand what's going on and help you come up with a better plan to stop this. I will say this though: remember, it's only a dream; that's all it can and ever will be. It's not a reflection of you. Is this dream a flashback? If so, then you've also got to remember that the past earned its name for a reason; you can't change it, but you can change the future and how you respond to it.
You will get to that point; that's why you're going to therapy. It won't happen in a flash, but it will happen. For right now, to take your mind off of these negative thoughts, immerse yourself into your favorite music or hobbies. For your next session, be sure to mention this to the therapist, alright? I'm not sure if I'm helping or not, but they should be able to do a much better job than I am at helping you. I'm always here for you, remember that; I can't do much, but I'll do whatever I can to help you.