In my opinion, the best way to stop obsessing is.....to stop obsessing.
Do and think about other things! Keep your mind occupied.

As for your other question. No. You are not crazy to keep hope. Hope is good. I like to think about it this way: i know I would act differently if I knew there was a 75% chance, a 5% chance, and a 0% chasm e my W was going to come back. When I look at those options, the AZZORK I like the best is the one where there's a 5% chance she comes back. Since nobody has any clue what the actual chance is, I choose the 5% chance Azzork to be. Hence, there is hope!