Hi Jessica,
I suggest this as a form of immediate action:
Call the local hospital that has a psych ward or psych emergency room, ask them these questions:
1. My husband is exhibiting the classic signs of schizophrenia, it has gotten worse, I have children who are in danger, and my husband isn't taking care of himself, and isn't taking care of the kids. I fear for my life and the safety of my kids [lay it on thick if you need to]. How can I get him hospitalized right now? How will I be able to make sure the insurance pays for it? [You should know the phone number and the ID number of your husband's insurance, and call them up after you call the hospital, to verify they will cover a stay there, and for how long and how much they will pay.]
2. The hospital will do bloodwork to rule out or confirm the diagnosis of schizophrenia as opposed to another medication condition, like drug use.
3. Call the hospital AND the cops. Explain to the cops what is happening, and that your husband threatened to call the cops if leave with your son. A forced hospitalization could possibly require that you call the cops and the ambulance to escort him there against his will. So get the cops on your side RIGHT NOW.
4. Before you do what you do, above all, don't let on to your husband your plan of action, or he will make it difficult for you to see your son, especially if your husband has a job and you do not.
Again, I hope your situation works out so that your husband gets the help he needs, and you get some peace of mind.
Regards,
cb