To let go is never easy. But it's a stepping stone to growth, I believe. Know that letting go is for a reason and do it for a specific one. Know that it's just a small part of your life and that over time, you will be over it. I know it's not easy, but neither is anything else worth working towards. Do something to take you mind off whatever it is you're obsessed with, like go for a walk, a bike ride, or even a "presence walk..." Steve talks about that in one of his blogs, listed
here. I know it is good if I have some sort of nagging thought in my brain. Not only that, I feel it enhances my sensory perception tenfold. You finally see the beauty around you...etc.