R.L.
Hi L.,
After a quick skim of the other responses, I have to tell you that I see this a bit differently. Obviously, no one responding is actually home with you to see the interactions, but it sounds like the problem is with your husband, not you. From your description, it sounds like he's over stressed at work and possibly even a bit resentful that he has to "work hard all day" while you get to "stay home and play with the kids", which makes him resentful. Unfortunately, many at work parents have no clue how, in many ways, being a homekeeper and primary childrearer can be far more stressful and demanding than any employer! You're on cal 24/7 -- he works his 8, 9, or 10 hours and is off.
It's impossible to resolve any situation if the parties involve refuse to communicate. By shutting you out, he's saying (conciously or subconciously) that he doesn't care about the relationship as much as you do, and maybe doesn't realize what potential consequences could result from his behavior.
All in all, I think some serious marriage counseling is in order here if you want to preserve this relationship. Tell him you're going to find a counselor and make an appointment, and that you will go with him or without him, because you still love him and you want your marriage to work. At the very least, seeing a license marriage and family counselor will give you someone to talk to and who will be able to offer constructive suggestions. If your husband balks at seeing the counselor, tell him that most therapists will both work with the couple together and individually, so that he will have an opportunity to unburden his feelings without having to face you (at least at first!), and that a counselor might be able to help him with the stress you know he has to deal with. Above all, approach him from a position of love and concern. (Hopefully, you have mental health benefits as part of your insurance plan, as such benefits usually cover counseling.) Also, find a play group if you're not in one already and get out of the house with the kids. Build your own friendships and confidants -- everyone needs them! You don't need to have blood relations nearby to create a family that cares about you.
Good luck to you -- I hope you can get your husband to work through this with you, and if not, build your own support system.