Plse help

I took my almost 6MO baby to the hospital cause shes been sick for more then a week. She has a hard cough and runny nose. They checked her bugers to see if she might have an infection. Also they took Xrays of her chest to see if there was anything going on since she has a cough. Thank god every thing came out good. They only gave me nasal spray but not for her cough. Anything that I can give her? She bearly sleeps cause she coughs and coughs 😩