Being terrified is anxiety showing it's being well fed. Being terrified is not breathing enough to get oxygen in your brain to allow you to think calmly. Being terrified is allowing the worst thoughts you can think of grow and grow and grow to the point they take on reality.
Your husband is a whack job. Everything he's done shows forethought in malice, manipulation and lying.
In his statement to the police he said he mailed the keys back to you. Ooops, then he sold the car.. with the keys. Just one tiny example of how he's tripping himself up.
The calmer you are, the better you will be for your daughter. The calmer you are, the better you will be for yourself.
Give yourself the gift of long deep breaths. Stop moving Stop moving Stop moving And just sit.