I just thought I would mention that sadly, inpatient care is not cheap and a stay at your local mental health facility could bankrupt you. I am on Medicare, and was able to get help with my bill only because Medicare is a contractor and can control exactly how much a hospital can actually charge for a service. The bill I paid was only $1100 for a 7 day stay which isn't bad, but it still took me a year to pay it back and the hospital sure wasn't cooperative with me about letting me make payments. It wasn't true that I could just tell the hospital how much I was going to pay and they would be satisfied monthly if I didn't want to have to deal with collection agencies. According to my bill, they charged me $40,000 for the stay, but I didn't have to pay that; because, Medicare covered the rest.
Also, you have to be in it for the long haul, or it's better not to make him think there is hope that you will. You should be honest with him at all costs. You can't be in this expecting that things will smooth their way out. Medications only work for awhile in most cases and then have to be continually adjusted. Likely this will be a life long commitment.
And as far as it goes on the choking, he simply can't be doing that. A psychotic episode is not a reason for you to put yourself in a dangerous situation. It is imperative that he seek immediate help if he finds he cannot control his temper. That's what I find I have to do when my anger seems to be getting out of control. I call the doctor right away, and see to it that I simply don't become abusive. I don't use my illness as an excuse to be abusive to my wife, or in your case, girlfriend. Should he continue to have such psychotic episodes you definitely need to take steps to remove yourself from being within his grasp. It didn't sound like it had been that long since his attack to me. Maybe I'm mistaken. It might be a little to soon to judge whether or not he will do it again. But if he does it so much as one more time, you need to take a stand to protect yourself and get out of the situation. You simply have no choice.
He wouldn't be trying as hard as he should be if he does anything else to hurt you. He can pick up the phone and call his doctor or check himself into a unit all by himself if he feels he can't control himself. He knows when that's happening. He can do it. Don't let him tell you otherwise. You have to be responsible for your own actions in society. There are places for people that are not responsible for their own actions.