I am bipolar and I overspend too. I am very impulsive when it comes to shopping. I am not always hypo when I do that. In fact I spend most of the time in depression. I think I compulsively shop because it makes me feel better in the moment. I always beat myself up later about it. This is why I hate bedtime because as soon as lie my head on the pillow I go over and over it in my head and tortures me. But the cycle repeats itself.