feeling guilty. help me out please

m
Ok so tonight my mom is supposed to watch my son so mu husband and I can go out. It's the first time we're going out alone in 5 months without our son. 
I feel really bad leaving him but I know we need this time. What if he wakes up and sees it's not me and won't calm down ? I've also been working 15 hour days the past three days for a teacher education program and have barely seen him. What can I do to feel more at ease about leaving him tonight? Or should I just not ? Advice ? Please and thank you !! 

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