There can be any number of reasons why his behavior has changed, so there is really no point in my trying to speculate about that. In any case, his behavior indicates that he is in some turmoil, and it would be wise to arrange an evaluation for him. If he was succeeding in his former school, why did you transfer him?
I believe your cold analogy is a little inaccurate. This situation is more like having a fever after being in contact with people with various illnesses ranging from flu, pneumonia, chicken pox, and strep throat. You want the doctor to tell which medicine to take. But each illness requires a different medicine to make you better and without further testing there is no way to guess which illness you've caught.
Your son's problem could be anything from not liking his new school, boredom ( you did say his old school was more advanced), a school bully, or hanging with the wrong crowd.
If your son won't talk to you, maybe you can schedule a meeting with his teachers and see about his schoolwork. Maybe they have some clues about what is going on school.
In the end though, your his mom, and should just try having a heart to heart with him. At the very least re-assure him and just let him know you and his dad are there and ready to listen if he ever needs it.
Good luck!
What I am trying to convey to you is that he should be evaluated prior to your receiving other guidance. The guidance you need about how to interact with him depends on what is occurring with him. It would be irresponsible of me to guide you any further without knowing what is happening psychologically with your son. You are asking for guidance and I am offering it to you. Why are you reluctant to arrange the evaluation? I would think you would be eager to do so in order to help your son.
...if you keep me sending to a specialist, before to give me a fine hint how to stop pretending "there is nothing wrong with him" and to act in front of him... doesn't help at all.... This is like: you have a cold you go to a specialist to send you to the pharmacy to get a Tylenol (something that you could do before to go to a specialist). So before to go to see a specialist (because I don't think the situation is that bad, but not good either) I believe there is a way to make him talk about his situation. I am not too good at talking, neither his dad.
Regards,
Laura
The main issue is to have him evaluated and then take in the guidance of the clinician who conducts the evaluation.
I've moved my son from his old school because we've got a new hose and another neighbourhood. I would love to leave him in the old school but was too far for us to travel every day (more than 20km.).
I've just wanted to know if there is a way I should act to don't make this situation worse.
Thanks,
Laura