For the past 4 days…fine all day, it gets to dinner time and he starts looking pale and a bit off…says he feels sick, then after picking at his dinner, he throws up , usually a huge amount, most of what he’s eaten in the day 
I’m going to call the GP tomorrow, but wondering if anyone has been through the same.
No temp, slight snotty nose, not out of sorts particularly, still running around and wanting to play, alert and doing what he normally does.
He’s 3 years old, if that helps.