Recently I was called by one of my parents clients and asked for an appointment. We had met around one and half year ago for their little cute daughter (around 6 years old) who could not effectively handle separation when she was sent to her school. Parents were explained and then she could manage to get adjusted with her school environment.
Now as she moved from a pre-school into her school years, the issue has once again re-surfaced. This time the severity is perceived to be more than the last time, as the school authority had called her parents and informed that she kept on crying and remembering her mother in the school. She would become alright after coming back home and would remain happy until night before going to bed when she would once again start having anxiety and would cry and ask her parents not to send her school.
Another kid that I had an opportunity to help him in the similar situation used to vomit in the school when he cried at his peak.
In my personal experience, when my son Aaryan had joined his pre-school, he also experienced separation anxiety which was more than average.