Persistent Dry coughing covid negative.

Hello doctor, for the past 2 weeks I have been having Persistent Dry coughing which worsens when lying down. The feeling of mucus accumulation is felt around throat and chest area. Tried OTC cough syrups, specific dry cough syrups like Benadryl DR, lozenges but they provide temporary relief. I have tested for covid antigen twice in 2 weeks with 1 week gap in between and both reports are negative. I'm also on psychiatric medications for depression and anxiety as well as hypertension medications for the past 7-8 years. Similar symptoms were reported in last December 2019 and my chest x-ray showed some signs of pneumonia. Later sputum report confirmed it to be streptococcus pneumoniae and was treated with antibiotics and recovered from it. Is it possible if it is somewhat relapse of the same thing or could it be something else.