Fever and little fast breathing. Sister?

Please doctors I have twins a boy and a girl last week Monday they we're having cough dry cough coughing so badly that leads to vommitting so we rushed them to hospital they were given three days injections for malaria and thyphoid and given cough syrup too.but the girl got ill again after the injection doctor asked for chest x ray which was clear then full blood count shows upper respiratory infection he gave some medication now she is getting much better but cough is Stil there but no fever again , now the boy since yesterday fever even throughout the night I didn't sleep I kept cleaning him with warm water for fever to bit down he is breathing fast but not much, and whenever he wakes up he asks me for water only only water and I give little please doctors could this be same upper respiratory infection he is getting too just like his sister? Please what should I do am worried thanks in advance