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Does your husband have a psychologist or psychiatrist that he trusts and likes? If so, this would be a good place to start. Expressing your concerns to this person (and, if your husband is open to it, maybe even attending one of their sessions) would be a way to start a conversation about what additional help your husband could use and what you are worried about with the way he is living now.
If your husband is not already connected to a mental health professional it definitely is time to find one. You can do this through a search online, in your local phone book, or through word of mouth. It sounds like your husband could use a psychologist (for ongoing therapy and support) as well as a psychiatrist (for medication treatment).
You should also be aware that, if you are ever concerned about your husband's safety- if he expresses a desire to hurt himself- you can always call the police or bring him to your local emergency room where they have the ability to mandate treatment (i.e. require that he get mental health treatment- usually inpatient for some period of time).
Because this sounds very stressful for you, as well as for your husband, you might also consider getting some professional support for yourself. Finding a psychologist just for you to meet with and talk to about what this is all like for you could give you extra support and an outlet for your feelings; having an outlet can make it less frustrating and upsetting to deal with whatever is going on with your husband.
Psychologist
Doctorate in Clinical Psychology, 10 years experience working with individuals, couples, & families