Thanks for the query to H.C.M. Forum. Pleural effusion
Since , how many days ,you are having these symptoms.
Usually the treatment ( full course) of pneumonia is just 2-4 weeks depending upon the causative organism.
Mention the name of bacteria which were responsible for pneumonia ? X ray
of chest shows, both pneumonia and pleural effusion so please upload the report over this site.
As far as there is pain behind breast ( bone) is due to gastritis
Many drugs which are used in treatment of pleural effusion causes esophagitis.
Blood report particularly E S R is very important parameter in diagnosis of bot above mentioned conditions.
Hope I have answered your question.
If further any question I will help.