I Had A Triple Bypass In Mid September 2015 With

I had a triple bypass in mid September 2015 with complications of collapsed left lung & subsequent Subcutaneous emphazima. An extra drain was inserted in the left side the day after surgery for this. Now 6months later I still have numbness & pulling sensation on the left side. It is uncomfortable when sleeping at night & often during the day. Is this normal & when can I expect it to go away?