My 11 year old son has told me that whilst at school this afternoon he got a sudden, bad headache that lasted for about 2 minutes followed by sitting down via he felt rough and then apparently blacking out for about a minute.
No staff were around but a number of his friends were.
The school has apparently "made a note of it" 
But didn't tell me.
He now says he feels poorly and a bit dizzy (but not too dizzy for the iPad!) he had a cold last week and has other chronic health issues but nothing that should cause anything like this. I'm not a particularly paranoid parent - he's the youngest of 4 and has been hospitalised many times and I'm fairly very laid back usually but I'm a bit concerned.
Any ideas?