3 months ago I was carrying a tall not heavy box between two counters, I twisted and felt a pulling sensation below my left shoulder blade. That night when I went to bed I sighed and felt a sharp pain in one rib adjacent to where I had felt the pull earlier that day, from then on I could only sleep on that side with support under the ribcage. I was still functional with pain killers until about 6 weeks ago when the pain became excruciating one night and went to the local hospital where an xray revealed pneumonia. I spent 3 weeks in hospital and had my lungs drained and my lungs seem to have cleared up but I still have the pain which is aggravated by lifting and sweeping anything that puts pressure on my left side. There is also a feeling of numbness around the ribs as if coming out of a local anaesthetic. Could this be due to an injury to the Serratus Anterior Muscle.