Re: What is going on?! (sickness related)
Do you have them on probiotics or vitamin D? I'd probably try to strengthen their immune system and help them fight it off. Was there fever with the vomit? If not, could it be food poisoning?
I'd be concerned about the rash and try to identify the source. I'm not a big fan of cow's milk because no one in my family seems to tolerate it. It causes tummy issues for some and really thick mucus for others but no one gets a rash.