my kid is to be 5 yrs and is in UKG. he is particularly very close with one boy in his class. recently, maybe from a month, he started avoiding school wherever his friend isn't there. he cries every night about school asking if that particular friend will be present or not. even if he goes to school and didn't see that boy, he starts crying... and he keeps telling me "I don't want to cry at school" . I assure him he won't cry and its not getting any better. every day after 6pm this starts . he keeps chanting -"I don't want to cry at school". he is also teary when he tells it. even in between sleep he wakes up and keeps telling this. it continues till I drop him at school. and evening again the same thing. also he started biting nails... he often tells he feels like biting something. im unable to handle this. pls advice how to proceed further. its really stressful for him