Lost my Dad this week,
Sorry for your loss. The pain will lessen with time but not go away entirely. If I think hard about what happened with my mom back in '81 it still makes me start to well up.
In the beginning of November of '81 my mom checked into the hospital for testing because she was coughing up blood, but otherwise feeling OK. A botched procedure left her gasping for breath and started a downhill spiral of her condition that left her brain dead and us having to make the extremely painful decision to pull the plug on life support. I wouldn't wish having to do that on anybody.
She died a few days before Thanksgiving on her birthday, she was just 58. It had been a terrible painful three weeks. We were lost, just kind of stumbling around in a fog making Thanksgiving dinner. It was tough trying to be thankful that year.
So hang in there, the pain will lessen in time, and treasure all the good memories that you have of time spent with him.