C.J.
When my husband was going through this at work, I asked him one time - "Well, what do you want to do about it?" His answer was - find another job. So we came up with a new house hold plan (finances, etc) and he started looking for jobs and covertly applying. He had been miserable for about 6 months, but the fact I got it as a FT working parent and his support when he needs it, was helpful to him and gave him the permission he needed to go out and take a scary step in a scary time that ultimately benefited him and us.
Let me say that was a year ago and he is so happy in his new role. He is successful, has the time he needs to be a human and has been extremely supportive of me and the kids in what we want to do as a result of having the support from us.
I am not saying it is an easy conversation, but it is one you all should have.
good luck!