My Son affected by typhoid fever.

Dear Dr. My 3yr old boy having fever(3days)and cold(more than 8days. I have consult with general physician and they gave paracetamol and cefiximi.. Last two day's, we have given and no improvement. So they suggest to take blood check and found that effected by typhoid. So I went to pediatrician and he suggest to give Amoxicillin & potassium calvulanate Suspension, Para 250mg,dextromethorphan hydrobromide & Chlorpheniramine cough syrub and T.HHAZI 250MG(1/3part). These medicines will work to reduce the typhoid?. So confused and I am seeing the fever if I missed(1 instance) or 1hr late(3instance) to give para syrub at anytime.. Pediatrician told that give after these medicine, we will see the further treatment.. Shall I give Cefixime or Amoxicilliin as antibiotic. Because cefixime is higher end compare to Amoxicilliin. . please suggest n help me... Is there any specific antibiotics do I need to buy for Typhoid? Please help me.