At my wits end with CPS. Needing advice. Anyone been through this?

Okay, so long story short, here's what happened: On July 20th my husband and I had a miscommunication that led to CPS interferring in our life. He had come home from work and was in the shower. I told him over the shower that my friend was coming to pick me up and I'd be home in a few hours. I locked the door and left. A couple of hours later, I turned on my nearly dead phone and only had time to check one message before it died - my sister telling me to go to the house, somethings happened. So my friend rushes me home and there are cops there. I run over asking what happened. My husband had not heard what I said. He thought I was in the back room (my jeep was outside since my friend had come to get me and I usually take the jeep if I go anywhere) and he had left the house to run an errand, he said he opened the garage door and yelled to me (a me that wasn't there) that he'd be back in a little while. Somehow, when he was getting things out of the car, our three year old got outside. My husband didn't see him. Our neighbor found him outside crying and rather than waiting to see what the situation was, she immediately called the cops who called CPS. (this neighbor, by the way, never has liked us - it was a prime opportunity for her.) Anyway, when we figured out how careless we'd apparently been, we were devestated at the what ifs of everything and relieved that he was okay. We understood why they asked us to voluntarily place our two children out of the home while they conducted an investigation. They gave us a drug test which both came back fine but mine came back showing alcohol so then they kept our kids away longer because of that. I never understood that because I told her upfront I drink on occion but never around my boys. It has been almost two months since we've had our children here and my husband and I are both feeling so sad over this. We made one mistake. We would never intentionally harm them or put them in harms way EVER. We love them more than anything in the entire world. They are our life. They are the reason my husband works full time and goes to school at night and the reason I'm taking 21 hours in college right now. I call the CPS office constantly with no rarely returned calls. No one updates me on the case. The only time we were updated was when we found out that the detective decided to charge my husband with 2 counts of felony child endangerment, which he went to jail for, and if convicted, he'll never be able to get a biomedical engineering degree. I'd be the sole source of income for the rest of our lives (oil feild companies won't even hire felons) all over ONE one-time, never-before, never-again mistake! He's the best father. Anyone who knows us knows that. But the CPS people never talked to anyone except the people (like our neighbor) who hardly know us at all. We have no reliable family in our town so our boys are 500 miles away in my husband's mother's care, and we're going to see them when we can afford to or our schedules let us, and calling them everynight, sending them cards... but it's just not the same. I cannot explain how many times their empty rooms have caused me to break down into an avalanche of tears. I feel helpless. So does my husband. We're just a number in the system now... nothing more. Our family, our world, has been torn apart and nobody seems to care. No one seems to be doing anything to reunite us. They haven't even come out to our house to look around or interview us... nothing. One phone call once since this all started from my caseworker - that's it! I call and leave messages twice a week at least. I go up there to the office once a week. I've asked to speak to her supervisor and been given the run around - first it's because she isn't in. Then it's a different supervisor who isn't up on my case and cannot advise. Then it's something else. Everywhere I turn it's a dead end. What should we do? What can we do? We just want our babies back... we just want our family back. We are good parents... and our kids are the reason we breathe! Please... any advice would be wonderful... thank you.....