Pain behind shoulder blade

All of a sudden I get home from the pool last week and it feels like someone put a knife inside my right shoulder blade. Pain has still not gone away, despite backing off swimming (and using fins), ice, PT (which actually did help - stim & ulta), and stretching. Has anyone had this before? I have been swimming for a long time, had lots of various aches and pains, but this is a first! Thanks!!!:
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