Possibly stomach flu or Tamiflu side effects.
http://www.guardian.co.uk/society/2009/jul/31/tamiflu-side-effects-children
Half of children taking Tamiflu have side-effects
Nausea, insomnia and nightmares reported after taking antiviral drug for swine flu, study finds
Of the 248 pupils involved in the study, 51% reported side-effects, including nearly a third (31.2%) who felt sick, nearly a quarter (24.3%) who suffered headaches and more than a fifth (21.1%) who had stomach ache.
The researchers said "likely side-effects were common" and the "burden of side-effects needs to be considered" when deciding whether to give Tamiflu to children as a preventative measure.
The researchers concluded that a "high proportion of school children may experience side-effects of oseltamivir (Tamiflu) medication".
Another study, also published by Eurosurveillance, found that more than half of 85 children in three London schools had side-effects when given the drug as a preventative measure after a classmate was diagnosed.
Of the 45 children who suffered side-effects, 40% reported gastrointestinal problems including nausea, vomiting, diarrhoea, stomach pain and cramps, while 18% reported a "neuropsychiatric side-effect" such as poor concentration, inability to think clearly, problems sleeping, feeling dazed or confused, bad dreams or nightmares and "behaving strangely".
Hopefully, this will soon pass.
I do have concerns about using Tamiflu with kids, but with the hysteria that has been created with H1N1, it has become almost impossible for anyone to make sound decisions about when to use Tamiflu. If the medical profession and the media had been honest all along, we would know that the death rate from H1N1 is actually much lower than with the common flu we see every year. But many billions of dollars are being made by drug companies, so the hysteria does have its benefits and one can see that hysteria has been used for the intention of making large profits. And I will admit that as a parent, I too have no idea how we should proceed. As an adviser in this group, I also don't know what to say about this flu, other than wash your hands and eat well. Get plenty of fluids and rest and don't let yourself get run down where you are more susceptible to illnesses.
Sharmin, keep us posted. I wouldn't put too much concern into x-rays being taken, as it is the weekend and the medical staff will not be highly experienced and will run every test.