Really bad shoulder pain.?

This started several months ago and eventually stopped, but now it's occurring again. My range of motion is very limited right now and if I so much as move my left arm the wrong way, it instantly tenses up and gets so bad to where it hurts to breathe. The pain lasts for around ten minutes. It feels like a huge... show more This started several months ago and eventually stopped, but now it's occurring again. My range of motion is very limited right now and if I so much as move my left arm the wrong way, it instantly tenses up and gets so bad to where it hurts to breathe. The pain lasts for around ten minutes. It feels like a huge Charlie Horse and I can't move my arm when it happens. It's not really my arm itself, more the muscle surrounding the shoulder blade. Please help. I've tried looking things up, but I'm not getting any results. I'm 13 if it helps.
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