Anyone having difficulty adjusting to working again?

I've been working since August but I just can't seem to get used to it again. I'm a foster care specialist so the work is stressful and the hours are crazy, I did 37 hours in 4 days the week before Christmas. I've broken down several times at the fact I'm not with my baby. Even though she's with my mom and I know she's well taken care of I can't get over it. I'm to the point of quitting my job, even though we really need the money. I'm just hoping I'm not the only one having troubles or someone can tell me if they were able to get over it and if it gets easier. I was able to take 11 days off with her and now I'm not sure how I'll go back on Tuesday.