Squidipa - I'm sorry to hear you have so much trouble with pain. It certainly would be terrible to think DD was suffering like that. Do you ever get relief from paracetamol or ibuprofen? I have dosed her up tonight to see if it makes any difference. If it continues to go on. I will definitely have her checked out, but what kind of tests do you ask for?
As Ozzie said, it's hard when they don't yet have the language to explain. And I can already hear the doctors fobbing me off (kindly and sympathetically of course, as you do to neurotic parents)

Ozzie and GG, thanks for your replies, at least I know I'm not the only one wondering...

Hippie - I did read that heat helps if that's the problem. I imagine it won't be easy to try on a toddler who's half asleep and upset, but I will give it a go. Fingers crossed I won't have to and we'll all have a great night tonight for a change.

I appreciate your replies everyone - thanks.