Hi Huda,
I would take the expert's advice and make certain that your child's environment is safe that he is in with the home care, nursery, nanny or whatever else you have provided.  But, I would not take his behavior too serious, you mention that every 2 months you spend 10 days in home country house.  That is quiet often and maybe your child has grown very comfortable and in love with this environment where he can be other family members.  He may not had became as upset before as he is now, because he was younger and not as aware of his surroundings or the changes in his life and now, he is aware and just actually prefers being with family in your home country.  Not to be alarmed by that, most kids even on a yearly vacation, don't want to resume back to their routines, they had rather be back at the vacation spot, without the responsibilities and with more attention.  In this case, he travels there often and gets to get even more attention from extended family, who wouldn't want that?

Relax, he will adjust to the lifestyle that you provide, explain to him that you too love the home country house-don't use it as a threat against him, but assure him, that you too love it.  Then assure him that as you have been doing, you will continue to visit, make a calendar to count down the days until he can go again.  Give him something to look forward to, explain that you must do here, what you must do, but then you will go again to his happy place, and that he can be happy here too.  Also, I still would not over look expert advice, be certain that he is safe here and nothing is happening here to make him feel uncomfortable, and if all seems well here, then you'll know for sure that he's just a little "home sick".  Best wishes!