I'm sorry your baby isn't feeling well.
I know these little babies can't go that long without eating. Have you tried cookin him some chicken and rice? I might also give him some honey or karo syrup for energy. He really needs to be seen ASAP. I might even get him in sooner English speaking or not. I used to live Japan and needed to use a non-English speaking clinic several times, it always seemed to work out.
I will definately be saying a prayer for him.
Kim