Sorry to read all that madness. I wish I knew what to say, or at least had something new to offer to the conversation.
It just seems like this process is going to take a lot longer than expected. Is there no way for you to take your pets to live in the US?
I just think if he wants to be alone sooo much then maybe you should show him 100% what that would be like. A legal separation so you don't have to share your money with him anymore might be helpful to open up his eyes. I know you don't want to stay in Poland, so don't. Go back and get your baby animals and do what you want and what will make you happy.
Time to stop thinking about that DAM of yours. Drop the rope.