hi proveit,
I'm so sorry this is happening to you. Although it's fairly common for alcoholics and addicts to go AWOL, I would certainly file a missing person's report. Here in Colorado we sometimes find missing persons long after the fact (having landed in a position or situation where the authorities can't help them because of terrain, weather, lost ID+bump on the head, etc.), and having someone out there keeping an eye out for him can't hurt anything.
Peace to you. The waiting can't be easy -- sending you a big hug to get through this.
GL