App Store not working

I am a Romanian diplomat recently posted in Albania (Country which is not on the apple support list). I came here with my iMac 5k late 2015. Recently I updated to High Sierra and since the App Store does not work anymore. I tried everything. Sometimes, after I clean the Ram or change the country region it opens but still without the buttons on the upper bar (featured, purchases, upgrades). When I manage to open it, I turn on system preferences and click the update button and that opens my update page but I can not update any application. I don't know what to do anymore. Please help!