Hi Herotozero

You are in a difficult situation. I am sorry to hear about your father. Living in foreign country and having to deal with BPD. It is more complicated when kids are involved. How your kids are being affected? Is he talking to kids? You mentioned he was in therapy, he is not anymore? Can you talk about his behaviour when he is feeling good?
Dealing with rage is tough. My husband is able to control his anger as I am not ok with it, but I have seen some of such behaviour when he is not well and it is scary. You must protect your kids from that. What about boundaries? If you make one that when he is raging you take kids and you'll talk when everyone is calm? There are members here that are very good in explaining how to deal with that. Here is some resources that helped me understand the anger:
https://bpdfamily.com/message_board/index.php?topic=309757.0You said he is not talking to you for 3 weeks? He is still at home? Sleeping in the same bed? How do you explain to your kids that dad is not talking?
I understand your exhaustion. I live in a foreign country myself and we have a 3 years old girl. And we also moved more than once so making friends is not evident. I cried too when people answered me. It is only one place I can tell everything. People answering me makes me cry too. It helps to see things differently and not to feel alone.
Therapist is very good idea. Don't be ashamed.
RolandOfEld explained it well. Therapist will not judge you. Me too I feel ashamed sometimes for being in this situation I am now. But we need to look forward, not backwards. What I can do now to make it better. First, you need help yourself to get better. For you, for your kids and your husband.
I used to have anxiety that prevented me from sleeping. Long long years ago, so I started inventing stories in my head. Anything from action stories to decorating imaginary home. Lately I stick mostly with imaginary home. Helps my mind stay away from my troubles. I just tell myself that worrying before sleeping helps no one, it changes nothing. I also started guided meditation before sleeping. Very powerful too. You get to concentrate on your body and let away all your worries, so it is easy to fall asleep. You are tired, you need sleep. Do you have anything that you enjoy? Running? Reading book, taking bath? Maybe camomile tea in hot bath before sleep?When was last time you were on holidays? Do you have some free time for yourself?
Here are some more resources that helped me a lot when I was really down:
https://bpdfamily.com/content/line-cognitive-therapy-program DW