Whenever he sees DC my anxiety levels go through the roof
You need to keep tapping into YOUR body sensations and emotions around him - not what HE does or says (EVERYTHING is a manipulation - know that) - concentrate on YOU. This is your body telling you he is unsafe, unpredictable, dangerous etc. Listen to it. Act on it.
Then sense check that against the long long list of incidents / behaviours. Often we forget some of them - that was our coping mechanism when we we with them - but list them out one by one and you can then see in the cold light of day the consolidated and totality of his behaviours. These have injured you - so minimise exposure to him because he is a constant threat - that’s what the anxiety is - hyper vigilance waiting/wondering what his next mood / manoeuvre will dictate or trap.
The nightmares are important. This is PTSD.
This is what he has done to your mind and body.
You are at a crunch point now that’s why you feel stressed - it’s coming to a head - he has been bleating, begging and manipulating for 6 months - the kids don’t yet know - you haven’t yet see a lawyer - so it’s all at risk of falling back into reverse.
Listen to everyone who went back - you will just have another decade of hell and your DCs will suffer.
You are at a cross roads. You need to take some actions:
See a lawyer - initiate proceedings.
Let your DH know and expect his behaviour to erupt - so get emotionally and physically protected beforehand.
Change the process if him being in the house with the DCs. It is up to him to make suitable arrangements. This is not appropriate for your DCs or sustainable for you.
Tell your DCs - they already know.
Don’t feel guilty.
Look at filling your time with training / college / skills courses / hobbies / connecting with other adults socially.
Look to have gentle fun rituals with just the 3 of you - pancakes for Sunday brunch, walk to a market / park on Sat, cooking together, watching a TV series together. These are simple peaceful activities that will bring you all comfort.
Well done on getting him out of the house. That was a monumental achievement - chapter 1. Chapter 2 needs a few actions and formalities put in place as mentioned above (lawyer, telling him, telling the DCs) - alongside planning and looking forward to a much more emotionally balanced, nourishing and joyous life.