Stomach Infection in 2 years old baby.

My daughter is 2 years old, yesterday she was not eating food like normal and was having light fever. We went to see a doctor, doctor gave medicines Syrup Oflomac m 3ml twice, O bact 5 ml twice, Zincogut 5ml once and Lanzol Junior one tablet, but when we gave Oflomac she vomitted, after 45 min we gave again then it was fine along with Zincogut and Obact, we thought of giving the Lanzol Junior in the morning, but early in the morning she was having light fever so we gave paracetamol drops, she immediately vomitted and when feeded with milk she vomitted the whole milk after 15 min, we again visited the doctor the next day, he gave ondem injection and told to give ondem syrup twice a day. but she is not eating like she was eating before, she is resisting for everything we are giving and also she is having fever after some time.what to be done to get quick relief. In liquid except for water she is not taking anything, she starts crying whenever she is offered food or other drinks like ors.