Memories stay the same when life changes and moves on, the only thing to do is just move on with it. God has great things in store, you don't have to forget the past, but you can't live the perfect plan for your life if you can't move on to it.
Drugs and alcohol make pain bearable for now but the addition can hurt so much more. We need to face your pain head on and sober so that you won't need to numb your pain in the future. Social use of drugs and alcohol can quickly turn into an addiction.