Nagging cough

I don't know why but Valerie just can't seemed to shake off this nagging cough of hers. Last Monday I just spent S$107 on medical bills due to her persistant coughing. Dr Low said she has a slight asthmatic attack and neb her in his clinic. She was supposed to be on neb that week but as the machine was with my SIL, we only gave her the new puffs Dr Low prescribed. She seemed to have recover well despite the fact we didn't neb her, but yesterday night, the cough seemed to be coming back again. :-(