Tammy, just keep telling yourself that your son will be safer with his dad. Once your situation clears up more, he'll be back with you. Meanwhile, you can concentrate on you and your girls. You will get through this. You will. I don't know if you've been able to eat, but try to get something nutritious into your stomach and get some sleep. In the morning you can call and talk to your boy. He'll probably be worried about how you're doing, but relieved to be away from the scary atmosphere.
This won't get easier for some time yet, but you're on the right road. Just try to hold out for a while longer. We're all here supporting you from afar.

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