My son has been diagnosed with ADHD only 1.5 years ago--he is 11 now and we used medication for only 1 year. I don't know what made me quit this summer but I found that my son is a lot more pleasant without his meds than with his meds. Though I was glad that he was on meds for the time being because it helped him incredibly with his schoolwork. And even though before I was dead against meds I'd suggest now to everybody to go with meds so that you learn again what normal is. Anyhow, I liked his psychiatrist a lot and we had a lot of medication trials--not so much switching on the brand itself but dosage, medication that would help him with his sleeping problems, there was a time when we thought he needed to go on a med that would increase his appetite as we was loosing too much weight. So hang in there.
I was also though very adement that he would get psychological help at the same time and that was hard to initiate but then we found a professional that I like a lot. One thing that the psychiatrist even told me that if I was looking for a 'puppy school' and was hoping that I'd drop off the child and get back a functioning child after the sessions then that would not be the case and I might as well leave it be. Psychology visits are almost more parenting school then children learning something. And now that we have been going for a while I am so with him. My child goes in talks to the dr. and then 1/2 time we switch places and I go in alone. And he wants to hear how my life is going with my son. He never tells me what he talks to my son but gives me tips and strategies and I can ask him questions on how to handle different situations.
So besides finding the right meds for your son I encourage you to go and find a psychologist that you both like. But there are also lots of intersting rescources on the internet. They have helped me too a lot to understand more about ADHD and therefore make dr. visits totally different, rather than you needing to believe everything you can have a more active part on a lot of things.
2 sources I found interesting were: http://www.adhdfamilyonline.com/public/main.cfm
I am getting his free newsletters (too be honest I don't read too much there anymore but..) and he did an internet ADHD expo about a year ago where I found this lady: http://www.addclasses.com/classes/
She offeres about twice a month free tele seminars (I only have used her free stuff so far) and next week she has a free tele seminar on: The Stages – What to Expect After an ADD / ADHD Diagnosis
I think these are great rescources that you can use living overseas--which can be trying as well at times.
Good luck and know that you are not alone. As he gets older and older you will realize that your son is not the only one, actually I sometimes wonder if our special children become the 'norm' and the 'norm' children become lesser and lesser. But then again what is the 'norm'???