So my poor DD, 14, woke late this morning and had bad tummy cramps. I originally thought it could be down to her period but she said it was above her belly button and different to any period pain she's had previously.
Got progressively worse and then she started being sick at about 5pm. Has been sick probably every half hour since, and the pain isn't letting up.
Called 111 at 6.30pm and after a triage they sent us for an out of hours gp appt at 9.45pm. She had a mild temperature before we left but noticeably cold hands I thought.
Told the gp everything, including that we'd had a takeaway curry last night but that both daughters shared a portion between them and my younger DD 2 is absolutely fine. She had a feel of her tummy which she said wasn't guarded. Tried a finger oxygen monitor but said her finger was too cold so couldn't get a reading.
So her diagnosis was that it was possibly food poisoning.
So my questions are...
If you share the same portion is it possible that one person can get food poisoning but the other doesn't?
If it is food poisoning how long will the cramps and vomiting last? She is really struggling now, she is drinking a fair bit as we've said that's the best way to clear out her tummy ( no idea if that's true but don't want her to get dehydrated ). She is literally vomiting lots of greeny, yellowy liquid.... bile I presume ( sorry if tmi ).
I have never had food poisoning so no idea how long this will go on for, or how long she can cope with so much vomit...it's been 7 hours so far 
Is there anything else I should be looking out for. No rashes of any kind and her temp is 37.4 at the mo.