Hello, my baby is 3 yrs old, nd for the past 7 days he is suffering from cold, blocked nose, nd he ws unable to sleep through the night, his doctor gave him RELENT , he ws a little better but coughing started nd its very painful to see him coughing so heavily nw the doctor hs given him ZYRCOLD, his coughing sound hs become thicker, nd heavier. Please help what should I do. .thank u.