Had exactly the same troubles after I got my CBT - we have all been there mate.
Just stick at it and don't give up.
What really cracked it for me was to go somewhere quiet and practice and practice - theres an old power station near where I live and no traffic is around there an I went down there quite a bit to really get used to my bike.
When you are happier, try and get out every single day / night on the roads and slowly but surely, you'll suddenly find yourself in a routine where things are just about second nature.
Keep at it.