The obsessive mind is fed by resistance. Whatever you feel you are obsessing over - yourself, someone else, a task, an event, a worry - whatever it is, notice that the very act of obsessing, is an attempt to get you out of it...
Meditation & Obsessive Thoughts
I suppose the main message of that book is that there need not be any ideal way to feel, that thoughts are very difficult to stop or block, and any self-created suffering will strengthen itself the more you resist it, judge it has bad or want it to be gone; that you are already that in which thoughts and sensations and emotions appear and disappear...