kyle issues

I've been called to the Principal's Office this morning in Kyle's school due to some issues he recently had. Yes, Kyle's just in Kindergarten and he already has school troubles :(

Last Tuesday, when I dropped Kyle at school, I left him smiling while writing some notes on a piece of paper. Everything was just fine. When I got home in the evening, my husband told me that when he picked up our son during Dismissal period, Kyle's eyes were red and puffy and his nose was running. His teacher told my hubby that Kyle started wailing after their Recess until the last few minutes before they were sent home. When his teacher asked why he was crying, he just cried some more. When my husband asked me at home, Kyle simply said he missed me a lot and he wanted me to go home soon.

The next morning, Wednesday, I asked Kyle's homeroom teacher if she had any idea why he cried at school. It was then I learned that teacher's aide Mariz scolded him for playing with his hankerchief. Kyle twirled his hanky on his left hand (like a boxing glove) and wiped his nose using that makeshift glove. Mariz got his hanky and hid it on Kyle's bag when my son was not looking at her. Unfortunately, my son cannot properly concentrate without his hanky and so he got panicked when he didn't see it, so he started crying.. poor boy :(

Yesterday, another thing happened. Kyle's adviser told me my son vomited shortly after Recess (again!) after running and chasing his friend Reyster. Apparently, his tummy got all troubled and heaved, so he threw up his food and got messy. Teacher Vagay also reported that Kyle refused to be seated next to his group mates' table because he preferred to be left alone in his chair. He also defied his teacher's instructions to raise his hands properly during the Early Exercise routine or when she asks him to write his answer on the board. Sometimes, he also got emotional when he hears his teachers shout or when he is getting reprimanded.

I apologized to Kyle's teacher and told her that he is quite different at school when compared to his behavior at home. Likewise, whenever I ask Kyle about his school activities, he would just shrug his shoulders and tell me that everything went just fine at class.

I think there's something wrong with my child or with my upbringing of him; I really don't know. Kyle is a jolly and normal kid at home, he smiles a lot and hugs me a lot and always say I love you to me, his dad and brother and his grandparents. He even got a girlfriend! 

I just believe that Kyle is still young, perhaps he is really a loner and much prefer to be with his younger brother. I've had a long talk with Kyle's teachers and they even assumed that maybe I was quite emotional and oversensitive when I was still pregnant with him. I wonder if that could be psychologically true. Well, maybe at that time I was still adjusting to being a new pregnant mom so my being sensitive might be a good reason. Oh gosh, I really don't know.

Is there any child psychologist out there who can give me advice?