Hi. I've Had A Gastrectomy Done In March 2014. Since

Hi. I've had a gastrectomy done in March 2014. Since then, I've had severe pressure on the lower half of my ribcage. It feels like someone's literally sitting on my ribs. It is equally painful on the right and left. The pain intensifies when I lie down. In the past month, the intensity of the pain has increased so much that I need to take pain analgesia just so that I can get some sleep. Please advice. Thank you.