Ok, I missed the bit where he grabbed you by the throat. This is not "choking." This is strangulation. It's a terminology issue, but it is a big deal. It's a FELONY in many states, a strong predictor of future homicide, and a BIG red flag as part of a lethality assessment. Yes, you need a restraining order. And yes, he is unhinged. And please call your local DV shelter to discuss options - it doesn't mean you have to go there, but they will give you help and options. ShootingStar nails it again. Please listen...
Be safe.
72 hour holds are just that - normally not all that long. Time to circle the wagons.
Hugs,
D