See if your city as 411 a number you can dial for assistance. They can usually lead you in the right direction if you have that number.
If he qualifies hop on unemployement immediately as the wait time can be 6weeks or more right now. Apply online takes just a few minutes.
also Foodstamps can get sped up for job loss, WIC you 17 mo old will qualify but not your 6yr old but will help a bit, Call the 6yr olds school and let them know so you can get either Free or reduced lunches, Churches help in situations like this, there should be many food pantry's to go to in the area (google search them)
Get deferances on loans if you can't pay them, Student loan can do this and even others if needed. Once you get into a place like WIC they can help you tremendiously for all other needs
I also want to say you can get through this...things do happen for a reason, my husband lost his job 18 months ago and now has been happily employed at a new place for a year now, we were out of work for a while and I was scared as we had just found out we were expecting our third when he lost his job, now we live halfway across the country closer to family again, with a happy healthy 5yr old 3yr old and 8mo old and doing fine! You will get through this! Take the help while you need it that is what it is there for!