1) In pneumonia
pain may be generalised like both in chest and back or may be localised to a part of chest or back( depending on the part of lung involved). So pain in back may be due to lung scarring or inflammation.Back pain
can be caused due to a variety of factors. Therefore, it is wise to consult the doctor and get the condition diagnosed.
2) Heaviness in breath is due to lung fibrosis
and scarring. Recovery depends on the severity of fibrosis. There may be complete solution of clinical symptoms but there will always be some residual radiological changes.
3) Do chest exersice by incentive spirometer at home. It will help in quicker recovery. Avoid cold
as it can precipitate the breathlessness.