You are a man who doesn't want to lose his family. I am truly sorry that you are going through this pain. I see you trying hard to follow the advice given, and I admire a man who does it with the intent of reaching his goal.
Probably won't make you feel any better, but I always believed that when we couldn't get a flight out....it was for a very good reason. Your kids will still be there waiting. I bet they are missing you too.
Have you bought something cool for your kids to take back from the USA? You gotta do that!
It is not about what you feel should work in your M. It is about doing the work that gets the right results. Do what works!