My son is 13, Autistic "severe" non verbal I've accepted that... Over the last 3 days, he has been acting strange.. His eating has changed, he no longer wants to eats what he likes/ loves, and doesn't want to eat period. He has been sad and irritable, crying and frowning... He's terrified of being alone in the dark lately and would usually just sit in his room with the lights off and now he is not sleeping.I'm not sure what gives he isn't sick just melancholic. Has anyone else encountered this??