I think they keep coming for quite a while, but the gaps between get longer and longer.
Read Beatrice's recent posts for a message of hope.
She also thought she would feel this way for the rest of her life, but it gets better.
On the feet-dragging: I think they do this as part of the script. There's always something that keeps them going at us. They can't just break off completely. But it's cruel and it teases us into thinking we might be seeing baby steps.
I'm not so sure any more. Often seems like a sign they are still firmly in replay: confused and selfish.
I'm just trying to resign myself to a very long haul.
I don't believe they will ever have a chance to do the work they need to do while they are still 'connected' to us.
Being connected financially/practically means we are always 'available' to be blamed for how they feel/what is happening in their lives.
You might like to search out Ali Suddenly's posts for a glimmer of hope. Her sitch was a bit similar to yours and she is a great writer: