What Causes Pain In Rib Cage Area After An Injury?

hi doctor i had a fall in last year august but did not have any problem except a mild pain in the right rib cage for a week. a month back i had a nasty cough and after that i have been suffering from sharp ,severe pain on my right rib area particularly on certain points in fifth rib.i consulted a physician and he gave me inj.voveran ,antibiotics and tab ultravist.i still have the same intensity of pain.what will be the reason for the persisting pain?will i get a relief from this?i am worried a lot because i cannot do my work.kindly help me.