For four days now he's been sleeping for 3-4 hours. My son is 1.5 year…

For four days now he's been sleeping for 3-4 hours. My son is 1.5 years old and has bronchitis. We were prescribed antibiotics. After the second injection, the temperature finally went down, but the child is lethargic, diarrhea, doesn't eat, has become thin. Today is the third day of antibiotics, and the child is still capricious, crying. The pediatrician said it was normal, continue the injections. To calm him down, we went to the polyclinic, they also said to continue, but to do an intravenous drip (glucose, ascorbic acid). We couldn't get the drip - he cried loudly, struggled. All day the child is weak, but the doctor said less, there