I am so sorry you are going through this, and with another little one on the way.
I agree with Catlovermi in contacting Alanon when you get back stateside.
I raised two daughters on my own for the most part. Neither dad took an active interest in their lives.
My 33-year-old is an active addict, but that is her choice. She's been around the rooms of recovery since 1986 with me (I'm in long-term recovery). She knows there is a better way to live.
My 23-year-old is an avid horsewoman (has 6 horses), works full-time for our veterinarian, and is kind, witty, and giving.
I know it doesn't feel like it right now, but things will be okay.
Sending you hugs of support!
