First of all, if you love him and he loves you, work it out.
2ndly begin to first look for others to meet your needs and begin to love yourself. ( no I am not recommending a boy friend!) I am recommending that you find a way to connect with other moms and build yourself a support system. Do one nice thing for yourself every day.
If you are depressed it is also important that you get out doors and walk every day even if it's just a half an hour. Then think through what nice things you would do if you were single for yourself. Begin doing those things for yourself instead of expecting him to pamper and care for you. Men don't do well with needy, especially if they are already stretched to their limit. When he sees you caring for your own needs and having your own life he will be excited and will want to do more with you. Right now doing these things for you is just one more thing on his to do list.
Also start doing for him the things you maybe wish he were doing for you. Or, more importantly perhaps different things since his needs may be different. How can you lighten his load and help him recharge his batteries. How can you put more fun into both of your lives? How can you brighten your home and yourself? Start small, maybe playing beautiful music each day while you are home....( make your own station on Pandora.com)
Get yourself a beautiful journal and each day write in it about what you were blessed with for the day, it will be amazing and will change your energy when you begin to notice what you did not before. Every day go out of your way to notice something you appreciate about him and thank him for it. Right now he is feeling like all he does is work hard to take care of you all and that more demands are being put on him, but what he is doing is not appreciated. It is amazing how much more people are able and willing to give when what they are doing is recognized.
Instead of telling him he is not paying enough attention to you, notice and praise every bit of attention he does give and every thing he does do, won't fix things right away, but will help. You will feel better too since you will be focused on the positive, and you get more of what you focus on.
Do all you can to help yourself not feel depressed, work on that first, then focus on what YOU can do to improve your relationship.
Also does he like his work or hate it? That makes a huge difference. I have been married for 24 years and much of that time my husband hated his job. That has a huge impact on our lives for sure. He will have to work that out for himself, but sounds like that is having an impact since it is draining his energy.
I will tell you that the more I have taken care of myself, the more my husband has been willing to do for me emotionally. The more I have had friends I could rely on as well the more he has been there since he did not feel he had to carry the whole load.
I also will tell you when my husband took a job that he actually liked, even though he is now often gone months at a time, the happier we all are, because when he IS home he is mostly happy and more able to give of himself since his cup is more full as well.
I would recommend 2 books, one is called How One of You Can Bring the Two of You Together. I would also recommend the book The 5 Languages of Love ( I think that is the title)