Fast breathing for 3 years old.

My son (12.5 kg) developed a cough 3 days ago. Initially, Asthalin syrup was prescribed. That night, he developed fever. The next day, he complained of left ear pain and was prescribed antibiotics. Later, he developed fast breathing (52–55/min), initially without wheezing. The following day, chest retractions (pulling below the ribs) appeared. The doctor detected mild wheezing and prescribed Budecort, Duolin and Levolin nebulization (2 doses). He was also given Omnacortil syrup. As symptoms continued, another Levolin nebulization was given in the evening. In total, he received 3 Levolin nebulizations and 2 doses of Levolin syrup (5 ml each). However, his breathing is still 52–55/min. Fever is around 100–100.3°F. Another doctor advised stopping Levolin and continuing Omnacortil only. Chest X-ray showed no pneumonia or infection. Can Levolin cause persistent fast breathing? Is 52–55 breaths/min normal for a 3-year-old? Why is fast breathing continuing despite treatment n normal xray