My son deals with ADD and has been on (& off for a short time) medication since 1st grade. We only do medication for school but that was our decision. It does take a while for anybody to get used to any medication - let alone a child who is still getting used to the world, life, learning how to live in society, etc. Add to that the irregular schedule of Christmastime, more sweets around the house, family members & friends coming and going, etc.
I think most children get a little crazy around the holidays - anticipation makes them nuts, it's an exciting time and they are still learning how to process and handle excitement.
A couple of things I've learned about ADHD and ADD medication over the last 7 years: you may have to try different medication to find the one that works best for your child. there are a lot of different kinds and your doctor doesn't know all the details of all the medications unless he/she specializes in pediatric neurophysiology. Do your research different medications work best for different condidtions, different ages, etc.; I've learned that there's a "coming down" period at the end of the medication's time span. My son's medication has an 8 hour span - the last hour - which is when he comes home from school and the hour after that are tougher times periods. BUT wouldn't you rather have your child at home with you during that coming down period - so that if he gets cranky, impatient, tired he's surrounded by people who love him? This gets lets prominent as the weeks go by too. - Finally, most kids need a low dose - very few kids need a higher dose and frankly, I think most drug manufacturers don't make a low enough dose. My son was on 10mg of Focalin XR for many years and we only moved him to 15 mg this year - He's 6'1" and 185 lbs. 10 mg is the lowest dose of this drug!
You will get through this mama, you son's ability to focus will get better, he'll do better with his peers, in his classes and eventually at home. How good that you've recognized this and are helping your son early in life while he can work to overcome that "scatter-brained" feeling. I wish I had the medicaiton when I was young! YOu're doing what you need to do mama - you're a good mom and your son will come along well. you go mama!