I'm not sure if that's what DS has, he has a lot of unexplained stomach aches, usually in the evening. I thought it was a ruse to get out of bedtime, but it's been going on for ages, around 6 months, and we have never let him stay up as a result of him complaining about his stomach. He's 9 so if it was a ruse he would by now surely have given up? He isn't constipated, it doesn't feel like it's his appendix - he's had it so long if it was appendicitis by now it would have worsened. It's not trapped wind because farting doesn't bring any relief. He says it feels like someone gripping his stomach tight, so I've given him hot water bottles to help ease any spasms which he says does help. He's always fine in the morning, and has normal appetite and isn't losing weight.