I can't ever spell it properly. So runny poo it is 
DS had a bug over the end of last week/weekend. He threw up on Thursday night/friday morning (middle of night). fever, burps, bloated belly, general malaise on friday. Saturday much better, not 100% but mostly tired, ate ok and no vomiting since Friday early am, but complained of feeling sick in the morning, and lots of burps one after the other. He also had a couple of farts that he 'followed through' on a tiny bit, but no runny poo. in fact, no poo at all.
Much better yesterday. No poo. Complained a little of feeling unwell, but also knows that gets lots of sympathy!
He went to nursery today as he was fine, ate breakfast fine, no fever etc. Picked him up from school, and while waiting for DD he went to the bathroom, in there for ages! Very runny, not a little of it either, it just kept coming and he said his belly hurt a lot while he was going to the loo.
He had a swimming lesson, so needless to say he didn't go to that!
Then again when we got home, more of it. Hardly ate anything, behaviour off.
Firstly, I know the answer, but just checking as I need to be clear with DH as he is at home tomorrow day time, and DS is known for bouncing the walls when he is not at pre-school - but no pre-school tomorrow right?
And secondly, is this usual for a stomach bug? DH wondered if it might be food poisoning of some kind as no-one else in the family have had it.