What Causes Pain And Swelling In Stomach And Ribs With Emphysema?

hi, my dad is 66 and had a decortation to his right lung in september 2011, they cut through his back to do it. since this op he has developed severe pain and swelling,not at the site of the op, but at the front. his stomach and where your ribcage is, he has had a scan and been told nothing showed up,his surgeon was quite defensive saying i didnt do that to you,but my dad didnt have this before. he has been to his gp who has said its an infection of the nerves, he gave him antibiotics,but there seems to be no difference,he s very down due to being in constant pain and feeling like he s going to burst from the swelling. he just dont know where to go or who else to see from here. any advice would be appreciated. thanks