Hello - My dog, a 5 year old American bully started coughing yesterday and we went to the vet. The vet prescribed Cuffwell syrup and to observe for 3 days as she has a respiratory infection. But I feel like the cough has increased and she is vomiting phlegm at times after cough/gag. She is unable to sleep as well. Is it normal? Or is there any other remedies?