Pretty much what it says on the tin! I know little ones can be prone to developing lactose intolerance after a stomach upset but he has soy milk due to CMPA so that can't be the issue. It's been a week now and he's barely eating either, I'd feel a lot better if he was getting some hydration and calories via milk but he just won't touch it. GP said yesterday he was likely a bit dehydrated so we are syringing water in to top off what he's taking of his own volition.
It's making bedtime an absolute nightmare. Milk before bed has always been the routine - he doesn't feed to sleep but it's the last thing we do before going upstairs for sleeping bag etc. I think because that's missing he's been awake until 9pm or so the past few nights despite being exhausted. We've tried offering a bottle or a cup of water instead but he's not interested. Also tried some milky Weetabix or yoghurt but because his appetite is shot he won't touch that either.
The actual diarrhoea only lasted about 24 hours and he was only sick the once. I'm desperate for some light at the end of the tunnel!