Suggest Treatment For Breathing Difficulty After Rotator Cuff Surgery

Hello!
Im 58 yrs old & on Feb, 6 2014 I had surgery on my left rotator cuff. I was given a shot to put a nerve block in & im not sure what they did for surgery. I was n recovery 4 more than 5 hrs. Trying 2 get me 2 wake up & to breath, When I ask the attending doctor, he said that it was the medication. now it's March the 2 and I still feel wiped out. I had the right cuff done in 08, & I didn't have this much trouble. In a wk. I was back to walking (in my sling) Can you shed some light on this ordeal.
Thanks JJ