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What's wrong with my arm???

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ok so 1st, I went to the doctor on fri. 2 get my last vaccine shot...and still 2day my arm hurts really really bad, at 1st I thought it was because I went snowboarding and it was just sore but my mom thinks its because of my shot and no matter what I do it still hurts...ad nything I do it will hurt, when I pick up my backpack I just cant sand the pain or even raise my hand it just really hurts...so does anyone know what might b wrong with my arm??? please HELP!!!