Hi L.,
We just did this, but in reverse. In my case, my husband became almost unemployed (he is a residential realtor, and let's face it, the market isn't so great right now!). Some of the things we did - and some of these were REALLY hard to let go of:
our house - we downsized from a 4 bed/3 bath on a half acre to a 3/2 with the smallest yard ever, and cut our payment by 60%. Yes, it completely sucks having a tiny yard, no home office, no surround sound, no granite countertops, ugly bathroom tile etc etc etc, but ultimately if I'm saving that much money I don't care! We have a roof over our heads, which is all we really need.
cable TV - we cut back to the most basic package, which cut us from $100/month down to $35/month. We have friends who still use the "rabbit ears" antennae and pay nothing!
cars - we do a lot of our own work on our cars. When my car needed new brakes, my husband asked a friend of his who knows how, to show us. He did, and I'm telling you now, I'm never going to pay someone $500 ever again to do it! Really easy. And now that I know how to change a tire, I cancelled AAA.
cell phones - if you only have one person working, you only need one cell phone. The person who's out of the house gets a cell phone. The other person doesn't. People lived for a long time before cell phones.
babysitting - exchange babysitting with other SAHMs. That way you never have to pay anyone to do it, but you still get time to go do what you need to do.
clothing - if you do not already have a source of hand-me-down baby clothes, check out consignment stores. Most of them have great stuff for CHEAP. I have not paid for new clothes for my girls in years - I just buy ones that other kids have worn once (or not at all) for pennies on the dollar. And if you're staying at home and therefore have more time to do laundry, your child doesn't need as many outfits! (And either do you =)
eating out - you'd be surprised how much you might be spending on eating out, coffee, etc. Pack your husband's lunch every day, send him out the door with a travel mug of coffee, and right there you save around $75/week (considering daily lunch out, plus Starbucks in the morning).
grooming - switch to a low-maintenance hair color, if you color your hair, and do your own nails and waxing.
That is what has worked for me. Overall we have been able to save around $4000/month (most of that is housing costs, but the other stuff adds up too!). This has made my husband's salary mostly unnecessary, so that when he does actually bring home money from a comission, we're able to put it toward credit card bills, savings, etc.
One final thought - have you considered that you might have post-partum depression? Maybe talk with your doctor about that, if you're having anxiety attacks and are sad doing things that you used to enjoy. Just a thought.
I hope that helps! Good luck to you.