Okay, try to calm down. It's already happened, so there is nothing you can do to change it. Try to use full sentences so we can understand the problem and help.
So you have a 13 year old DS on a CPP for emotional abuse, and he wasn't well, with a migraine, but you were stuck because you needed to work? You thought he'd be ok alone at home as long as he had a mobile phone to call you, because he just needed to sleep it off. But now you're worried that you'll be seen as neglectful?
I think all you can do is set out your decision making process. Think about those questions I asked:
Were you sure it was a migraine? Was it typical for him to feel a bit weak with a migraine? Were you confident that he didn't need to see a doctor and could just sleep it off? If so, ok. Next:
Were you happy that he was safe at home? Had you agreed what he would do if he felt more unwell (phone you?). Did he have a number for you? Was there food for him for lunch time? Did you call him to check on him in the day? (Shows you were concerned for him). Ok, great. Next:
What would you have liked to do:
Ideally, stay home. Explain why you couldn't, what steps did you take to try and arrange time off, was this refused? Etc.
They just want to see that you are taking responsibility for his emotional wellbeing.