I'm so sorry for your loss! I haven't lost a golden (yet), but I have had to have several other dogs PTS over the years. Each one broke my heart. I can only say that time helped eventually, but overall, all I could do was talk about them, remember the good times and when I was ready, adopt another. You can never replace a lost loved one, of course, but somehow, a new dog (pup or adult), is the only thing that REALLY seems to help me get through it. I seem to NEED a dog to love. I've always felt (hoped) that the one I lost led me to the new dog I needed....or who needed me. It may sound stupid, but I remember telling Max all about my late Sasha when I brought him home - (and I swear, he listened to my stories)!
I hope that you feel better soon. Post some of those good memories here (or not so good), and share them when you're ready....there's always someone here who can relate to your pain and grief. Sending warm thoughts to you & your family.