Leah,
I know I am late in responding. I started to respond yesterday and just couldn't think of enough positive things to say to you. I still can't but I still feel the need to share with you my experiences in hopes you might see the bigger picture here and see this situation thru your chilren's eyes.
My now ex-husband is a drug and alcohol addict. He was not abusive to me or the kids and as a matter of fact I didn't even know about the drugs for almost 2 years! He turned to alcohol since he had exhausted every financial way to get the drugs and that is when I caught on. I'm not gonna tell you how to feel or that you can or cannot make it work. That's not up to me to tell you. You need to decide for yourself, but I want to strongly caution you about your children. Even though they are very young, they know what is going on. What really pushed me over the edge and made the decision to kick him out right then and there was my then 3 year old daughter's comment. She woke up from her nap and sighed really big, then said "Come on Mommy". I said we don't have to go anywhere right now baby. She said "Yeah we do Mommy, we have to go get Daddy's car." I said no honey, Daddy's at work. He'll drive the car home tonight when he comes home. She insisted we needed to go get his car. Obviously, she had been thru enough of the DUI's and impounds, etc that she knew the process. Well, lo and behold, 2 hours later I get the call that he has been arrested and I need to go get the car out of impound.
This is my story and I know I am projecting my feelings here, but I just really want you to stop and consider the effect this kind of behavior can have on very young, impressionable children. I simply could not condone, explain or justify his behavior to her anymore, so I had to make the choice to remove ourselves from the behavior. It has been the hardest decision of my life to turn my chikdren into a one-parent family, but I have to put them first and for them to ever think that kind of behavior is acceptable is completely unacceptable to me. We are the role models for our children and they absolutely will reflect some of our behaviors. I'm not trying to preach at or judge you (although I probably am coming across that way). I just feel so strongly about the possible effects on the children that I had to speak up.
I feel terrible for you and I wish you a fast resolution, whatever that may be. Best of luck and wishes to you and your family!