I'm sorry to hear you're having these issues! I think a lot of men get depressed and don't realize it or want to admit it. It can be awful to be in a job you don't like that you MUST go to every day to pay the bills!!! Some men also have a very negative view of 'therapy'.
Here's what I would suggest:
1)Put it to your husband that you feel that 'the family' is in a rut- not just him! Explain to him how YOU are feeling and leave an opening for him to say how he feels, and maybe he will open up. Communication is key and just keep reaffirming to him how much you love him and you need him to keep the lines of communication open.
2)If you belong to a church, I would first go speak to your minister, etc. about it yourself. These days most clergymen also do a lot of family counseling and many families are going through situations like this. I suggest this route, because if your husband does not feel comfortable going to see a 'therapist' - he may be able to get his therapy elsewhere, through someone he already knows or is used to, like a clergyman.
My husband is very quiet but when we went to our pre-wedding counseling with the minister who married us, I was amazed at how he opened up in our discussion sessions! Sometimes just a few times in the right environment can really get someone to open up.
3)Whether you see a clergyman or someone else, tell your husband that you think BOTH of you need this experience. It sounds like you are weary and worried as well- tell him you really need him there to support you as you open up and I bet that would lead to him doing so as well. It may not happen all at once, but he may go and participate if he can tell himself he is doing it for you- and not just because he is depressed!
Good luck- I bet you guys can work through this! Just put it as something you BOTH need to do, just because of the strain of outside pressures- not because you are unhappy with your marriage. I'm sure it will be fine!