Sharp Stabbing Pain Under Shoulder 2 Weeks Post-op Breast Augmentation

2 Weeks of Mastoplasty & Aug. Sharp stabbing pain (level 8 of score 1 to 10)) under my left shoulder blade weaking me up in middle of the night 10 days after surgery. While I am managing pain day time with adequte medication 4-5 Panadol, the night medication with Capadex is not enough. I frequently weak up at night with sharp pain from day 2 after my surgery,and the pain rather increases than dedreases with time. What causing it ? What can I expect What help is available?