<s>[INST] Hello, My son is 9 and has been complaining over the past five days of being dizzy and his legs really hurting to the point he can not walk. There has also been some vomitting and fever within this 5 day time frame. Any ideas as to what could be happening with him? [/INST] thanks for asking question,I gone through your question. your 9 year son is complaining of dizzy, legs pains, fever , vomiting in last 5 days. If I would your treating pediatrician,  i would diagnose it as viral illness. and viral illness are cured by body itself in 5-7 days time. i would prescribe medicine for fever and pain ,like paracetamol in dose of 15mg per kg per dose . maximum can be given four times in a day. and medicine for vomiting like  ondensteron 2 mg mouth dissolve tablet . Give lots of fluid that will help for dizzyness. if not improved in next 2 days then would investigate for cause hope i able to answer your query </s>