Hi Huddy , sorry to read your still dealing with crap mate.

As NDY said , this needs to be sorted , mediation is a free way to get some cast iron agreement re the kids. W has the ability to still get to you and thats completely understandable but it needs to stop.

About W not showing any remorse or looking like changing her mind , she's not going to while the rope is attached because she knows that you would welcome her back or at the least , want her back. Her Plan B. I'm not saying she would reconsider if she didn't think you were plan B but it's not even a thought in her head right now.

I 100% agree with Ndy re your son , speak directly to the doctor and follow their instructions ( obviously with your input )
Can you be included in any visit your kids have to the D by way of eamil or letter ?

I have a cousin who went through a long separation and he went to a Guru type guy who basically told him to drop the rope , he did and worked hard to became the best person he could. I won't go into detail but the guru gave him.a whole new take on his thoughts and life.
My cousin is now mega successful and back with his W but he puts the reconciliation down to his dropping the rope and wanting nothing but the best for his W.

Give up mate, but just on the rope part, get on with livi g your life and enjoying it to the best of your ability. Good luck with the new flat and think hard about the mediation.

Take care Rd