Thanks for the responses guys they have been a great help.

DS sees a chiropractor so I might book him in a mention this to him to see if he can pick anything up.

Lenny, I do think it is the stuffy conditions that sets him off, I think he might get a bit dehydrated and then it goes from there. I might keep an eye on his food also.

Might get him check by the Doc too, rather do it whilst he is at Kinder than when he is at school.

Thanks again for taking the time to reply