Dear A.,
When my oldest son was in kindergarten, the teacher insisted that I have him tested for ADHD. He was very active and always on the go, but when he was tested the psychiatrist said his was not clinically hyperactive because he could concentrate when he wanted to. My question is if your son can do that? Can he concentrate on a book if he is interested in what is being read, game if he wants to play it, toys when he wants to construct something from? Because the teacher had no problem with him I do not think it is ADHD. It depends a lot on the teacher. My son was very creative and had gotten along fine in preschool, but his kindergarten teacher very structured and they didn't mix.
My second son, though not as hyper as his older brother was the one that got upset and really "throw a fit" if he couldn't do something like write a letter the way it was suppose to look, sometimes if the peas went into the potatoes, if I wanted him to wear something specific when we were going somewhere, or if we changed plans and he was looking forward to it. I felt like I was always "stroking him the wrong way." When I confronted the doctor about him, he told me that kind knew what they wanted and were usually smart (he got along well in school and was very smart and had a great memory too). They usually call this a "strong-willed" child and Dr. James Dobson has a book out called "The Strong Willed Child" that may help you handle him or decide if that is what you have rather than ADHD (or maybe a very active boy who is very, very, smart and therefore strong willed....a combination of both of mine).
I do not like medication, but sometimes they are needed with children who cannot concentrate and do anything in the classroom. I have worked in the school with some of these children and you could tell the minute they were in the classroom if the parents forgot to give the medication that day, also if they were outgrowing the dosage and it needed to be adjusted. Also do consider trying a diet that might help. Sometimes it is allergies and sometimes gluten can cause these problems too.
My suggestion would be to read Dobson's book and maybe try a diet and watch how things go when he gets back to school. See what the new teacher thinks. Most ADHD children need structure to function. Is your household routine structured? In other words do you have a schedule? My middle son did better with teacher who were structured, while the oldest needed to have one that allowed for creativity.
If you are in a medical group such as Kaiser or the like, you can have him seen by a psychiatrist, and then you will have a professional opinion. They are very good with the little guys and it is not a scary procedure...they just play with them and talk and observe them (you can even be present). You could also try http://www.ocbiofeedback.com/ since you said you are from Orange County. It's testing is free...I would get two opinions :) I did and both were the same.
Also, I have a lot of information on ADHD from working in the schools, so if you do find out he really does have it, I will send you some information and websites, etc.
You will be in my prayers as I know what it is like to have difficult children whom you love and just want the best for,
H.