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@DDM
Hi there, firstly the chain doesn't actually stretch, it wears out. The rivets rub against the bushing and after a while this means there's more slack in the chain. The chances are a your chain hasn't worn like that yet unless it's made of some silly easy wearing material not seen before in a bicycle chain. So probably your rear wheel has just moved in the dropouts. A tug will solve this problem and as far as the noise goes that's pretty likely to be dirt. A good clean and lube of the chain normally sorts out noise. Or as lpg says just tighten those rear nuts til ya can't tighten them no more!