Suggest Treatment For Fever Along With Leg Pain In A Child

My 4 yr old son was complaining stomach pain 2 weeks ago n had 103 fever. He had potatoes n ice cream d day before.. he was hospitalised n after discharge he complained of stomach ache 3-4 times..After stomach ache he passed motions..n vomited once..nw since yday he is again having fever n complaining of pain in both legs..he hd water melon n ice cream a little bit d day b4.. he is given following medicines by pediatrician Rinifol z..calpol 250..deletus d..frisium N Mox only in Case of up down fever