Depending on where you are, if you are an immediate threat to yourself or others, he can call the police to have you evaluated, but he can't commit you. It is hard to be a full time mother. I think some have a hard time understanding that. At work you get a break and sometimes a lunch - time for yourself. At home there is always someone who needs attention, another load of laundry to be done, dishes to wash, etc.
Can I ask why you feel like a failure as a wife/mother? I'm sorry your husband is being so unsupportive. That is the last thing you need right now. Are you getting professional help? Do you have any time just for you?

If you are constantly just giving and not getting anything back, you run out of strength rather quickly. No matter how much we try to believe the we have an endless supply of strength, mothers need to re-charge their batteries too.

Hang in there and keep us posted!