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New Mexico does offer a spouse protection from harm via the civil court system if you are the victim of domestic abuse. You can read the statute with regard to this here and the definition of domestic abuse, to which your circumstances would have to conform in order for you to be eligible for this protection. Frankly, while I understand your concern, it's not certaiin that anything your husband has done or said would rise to the level of probable cause to grant you a restraining order. You can find out more about how to get the civil order in this overview.
If you are unable to meet your burden of proof at a hearing showing that you need such an order, or if you want to go another route to get your husband some help, it certainly appears that he's a danger to himself and possibly a danger to others as well. You could report that to the police and ask that he be evaluated. The state has the power to involuntarily commit someone for psychiatric evaluation when they have grounds to believe that he's a danger to himself or others. If it is determined by the state psychiatrists that he is such a danger, they will keep him beyond the 72 hour observation period and treat him.
You would have to ask the police, and they could tell you if they filled out an incident report as a result of having come to the house. There should be some record, even if it's just an entry in the police officers memo book.
It could. It certainly doesn't hurt your position at all that you're stable and can provide a healthy environment for your children and that that right now he is/can not.