Therapy for labral shoulder repair

It has been almost 3 weeks since my shoulder surgery for a labral tear. I also had bone spurs removed. While I expected there to be some pain involved I am wondering if the sharp pains I still have when moving my shoulder a certain way are normal. I am out of the sling unless I am out in public but pretty much keep my arm at my side. However, I can hardly sleep because I can't get comfortable. The general tightness and soreness I understand. But should the shoulder still give me sharp pains if I accidentally "use" the area that was operated on? I have a fear about something not being right because a couple of days after my surgery, a heavy glass lib began to slide out of a kitchen cabinet and, while my are was in the sling, reached up and over to catch it. This hurt quite a bit and I didn't know if I could have damaged the surgical area. My PT seems a little puzzled by the pain but thinks I am just tightening up my muscles too much. How would one know if damage had been done post-surgery and if it wasn't healing properly.