Thank you risingsun,
for this wealth of information and insight. I absolutely agree and blame milk most of all. The first time I've told my daughter about it - she stopped giving him any milk and dairy. Today he is much better, and hopefully it's over. Didn't want to try ACV though. But if the need will be... yea, pinching nose - that's what we will do. And he is very often outside, so if the sun is out - he gets some.