How Can Fever And Diarrhea In A Child Be Treated?

My son was 4 yrs old. Last sunday he got fever and vomiting. we gave him Colpol 250 when fever was below 100 degree F and Meftal P of 6ml when fever was equal above 102 Degree F. after 2 days he started with frequent loose motions. when consulted with a pediatrician, they suggest to give ORS and light food. after that since 2 days he is suffering from motions with some blood and mucas. y day we visited the doctor again suspected that this is due to some infection and gave OFM suspension and Soborm Z sachet. after starting with OFM frequency of motions and blood mucas was reduced. but still he is having motions 3 to 5 times a day. plz suggest whether the treatment given to him was correct or any changes required in medication. Thank you in advance