The OP doesn't appear to have any problem expressing herself and, as she has effectively raised 2 children from birth to 8 and 11 years old alone, I don't see that any productive purpose can be gained by infantalising her.
If she remains in this abusive relationship it's highly unlikely that the OP will be able to build self-confidence by interacting with others outside of the family home because, as she has said, "if he sees me starting to get a life or might have met someone he will change his game and ruin what I've worked hard to do".
The fact is that the OP has been the primary carer for both of her dc since they were born, she has a supportive dm, and she can take up a placement in a WA refuge for herself and the dc where she will be given all the help she needs to claim benefits, apply for social housing, and counteract any attempt her abusive partner may make to claim she is an unfit mother merely because she self-harmed after discovering his infidelity.
Alwayssunny's post at 20.56 on 1 Nov (p 9) makes some pertinent observations. The OP has claimed she will lose her dc if she takes them away from the family home but, given that SS were notified of her brief period of hospitalisation and do not appear to have taken any steps to safeguard the dc from their dm, this would seem unlikely in the extreme and it would be scaremongering to suggest otherwise.
As the OP's partner is squiring the ow around Vienna for the remainder of the week, there is nothing to stop her making contact with WA and moving herself and the dc to a place of safety during his absence. After they have experienced living in a non-toxic environment, I very much doubt the dc will express any wish to return to the family home unless their father is out of it.