I had both of these problems, more before I went on meds. depression during the depressive phase made me not want to do anything or make any decisions and the racing thoughts of different outcomes when I was feeling angry and manic made it difficult to actually think through any one decision. I'm not sure what causes the obsession stuff other than at least for me, it happened during my more manic times, i.e. like a tape loop of whatever I was thinking about playing rapidly over and over again in my head that I couldn't stop. I have noticed much less of both of these issues in the six weeks I've been on meds and it feels good.