Why am i experiencing more pain and discomfort than before my right shoulder arthroscopy?

8 weeks post op for right shoulder arthroscopy. All i know at the moment is that i have had a bursectomy. Before the surgery i had full range of movement in my shoulder. I have been unable to raise arm above head, out to the side or behind my back since. Physio states that i may have an impingement of the rotator cuff or a tear. I am now very confused as i thought the reason i had my bursa removed in the first place was because of impingement? I have severe pain especially early evening and at night this can be both at rest or during activity. Sleeping can be difficult.

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