Another thought.. Can you get a job in the evenings? Your husband is home to watch the kids.. Maybe in retail. Book store, Maybe in a restaurant, tutoring. Check it out.,. He is the dad. It is a way for him to be with the kids..
Jaimee is correct. Your husband is depressed. It sounds like he is overwhelmed by all of this and a new pregnancy must be a surprise he was not expecting.
With every one around him expecting him to work full time and then look for a new job full time, it has overwhelmed him and he is needing a break from these responsibilities.
I bet you feel exactly the same.
I know you said insurance is terrible, but your husband may need to see his doctor and have his testosterone checked and maybe consider an antidepressant.
Try to find a time to ask him.. "How can I help you?" Consider not talking about a new job all of the time. See if he would agree to "game night" with his brother only 2 times a week so he can be sure to spend time at home with you and the kids..
Instead of watching so much TV, see if you guys can play board games or cards.. Maybe go for walks around the neighborhood. This way there is more talking going on.. and more time for him to be a daddy with the children.
Place bowls of vanilla around the house to absorb odors.. also sliced oranges and lemons will help.
Open the windows on mild days.. Go to the park for a picnic this weekend.. Get him out into the sun..
On the weekends could you do child care at someone elses home? Your husband could watch your kids while you go and watch other peoples children. Maybe look for people that you can clean their homes, do their laundry etc.. Lots of working families just need a few hours of cleaning per week and at $15 or $20. per hour, you could be a huge help to them.
Could your husband do small yard work or assist others with small fix up jobs? I have a friend that when he was searching for a job was cutting grass, helping paint houses, putting up Christmas lights, Repairing mail boxes, and replacing front porch lights.
He started out in one neighborhood (bunch of yuppies) and then this neighborhood started calling him to help at their houses.
He made great contacts doing this.