Sounds like all of you are going through a really rough patch. How about giving him a really good organic/biodynamic yoghurt. Not one of the sugar filled ones from the supermarket - one from your wholefood store. Also a few places sell probiotics for that age group but I haven't read enough about it yet to feel comfortable starting my DS on them yet. Maybe someone else can offer a suggestion about that.

I hope all of you are back on your feet soon.