The CBT can also have triggered this - in a good way. You are giving yourself permission to think about this surreal situation during your counselling and your brain needs to be able to process that. You've been running on adrenaline keeping everything together, counselling is about longer term solutions to managing the stress.
Why do you have to reply to him? Is this in relation to when the cuntcard is going to be topped up? Is he demanding you refute his list of dates and times before he will do the top-up? What will happen if you don't respond? Bear in mind, he clearly hates it when you refuse to take the bait - that should be reason enough not to reply in my view.
Have you taken any advice from SHL about managing the physical separation once he returns to the UK? On the plus side, it will be nearly school hols so there is the option to get away with the dc (to friends, parents, whatever) without having to be tied to the area.