you should see your doctor. sharp pain like that could be a sign of something serious but there is no way to know without seeing your doctor. this sounds like a pinched nerve or possibly nerve damage. cat/mri will be required for diagnosis.
sharp back neck and arm pain on the left side. this began suddenly about 12 hours ago. the pain worsens with movement such as using my left arm turning my head to the left or lifting my head in general. the main spot of pain feels like it's near my spine just under my left shoulderblade. if i sneeze the pain shoots up and down on my spine and out to my left arm occasionally leaving a numbness in my left hand. i am not an "active" person i primarilly work at my computer every day.