Naughty 5yr old

My 5 year old son keeps on throwing things at his classmates that result to hurting other kids. He is very competitive in school. He always wants to be the first in everything...first in arriving in school, first in finishing projects, first in brushing teeth after snack time, first in line,etc....The teacher says he does this because he is an only child and doesnt have any playmates at home, therefore he doesn't know how to interact with other kids and becomes competitive. Another thing is, he always throws up everytime he eats. Is this a sign that he has a behavioral disorder? Should I have him checked by a doctor? Im really worried...Hope someone can help!Thanks!

[jdtm]

A possibility - social anxiety.  Yes, behaviour such as your son is displaying can be from socal anxiety.  I might suggest you google the phrase "social anxiety in children" or "anxiety at school" or similar words/phrases to see if the descriptions are similar to those of your son.  If so, then it is time to see the family doctor (which I think you should do anyway).  Just a possibility ....

[Encephalomalcia]

A thought that comes to mind, is allergies.  Is he allergic to any foods that you know of?  Has he been tested for allergies or is he on allergy medication?  Allergies can cause irritability in children and aggression.  With him throwing up after eating makes me suspect allergies along with the behavior.  He could have a gluten allergy or a milk allergy.  You may want to get him tested or watch for any sign of rash after eating.  You could also keep a daily log of what he eats to see if there is a connection on the days that are the worst.