I totally remember manic behavior and how awful it was. I, too, have much shame about it. I call this "ruminating". The only thing I know to do is just to kick myself out of it and do something else. Call a friend, go for a walk...anything but think about the past.

Another things I did was make a list of all the things I've done. I then read this list to my tdoc. I asked her to just listen but say nothing. For some reason, it helped to have someone else know all this crap.