Hi H.,
I have a seven month old and have been back at work for three months now. I, like you, was totally distraught at the thought of going back to work in the weeks before my maternity leave ended. But I have to say, while it's tough to be a working mom and while I definitely miss my baby like crazy, being back at work is actually better/easier than I anticipated. Dreading going back was much worse than actually going back. For that reason, I think you should give it a try and see how you feel about it. Just as you couldn't have known how you much you would want to be with your baby before you became a mom, you can't know how you will really feel about being a working mom until you give it a fair shot (and by fair, I mean go back for at least a couple months before you throw in the towel, as the first couple of weeks aren't a good barometer since they will be hard no matter what).
On another note, it sounds like the bigger issue is that your husband isn't being as understanding or sympathetic as he should be. I think you need to have a long talk with him and help him see how hard this is for you. You are going to be miserable if the only reason you are working is because your husband is forcing you to. Decisions about who works and who doesn't should be made together, and neither of you should be held to all the opinions and plans that you expressed prior to having a child--things change once the baby is actually here. You two need to have a really honest, open discussion to re-evaluate your goals, desires, and plans for your post-baby life.
All that said, here's what I would do in your position:
*Reach some sort of understanding with your husband that you will try going back to work, but if after a set number of months (3 maybe?) you find that it's not the right move for you and your family, you will re-visit the issue
*Look into any part-time and flex-time options that your employer offers
*Make sure your child is getting very high quality care. This means either hiring a nanny with great references or getting your child into a top-notch day care. I LOVE our day care center, and that has made going back to work much easier. That said, we were on the waiting list for our day care for 8 months and on the waiting list for our second choice for 6 months, so if you aren't already on a waiting list, getting into a really good day care will be tough.
*Go back to work with the most open-minded, "I am going to try to make this work" attitude that you can muster and give yourself a good couple of months to get back in the swing of things. If you find that you hate it as much as you think you will, then make the leap to staying home full-time.
Also, I know many people say to put a pencil to paper and really figure out how much you will net from working after factoring the cost of high quality child care (we pay about $1200 a month if you need a figure to work with). This idea was never helpful to me, as I make substantially more than my husband and take home a lot of income after day care and associated expenses. But depending on your salary level, you may indeed find that working wouldn't really gain you much in terms of money, and your husband might be more persuaded by seeing those facts and figures than by less tangible feelings.