2 Answers

That could be serious best see a doctor.

Your description of a tingling filling from your left shoulder blade down to your fingers, corresponds some symptoms of a condition called cervical radiculopathy, which some other symptoms often also include pain in these areas, and at some patients a feeling that lifting the tingling arm above their head reliefs that feeling. These and some other symptoms may indicate having a disk herniation or an inflammatory disease in the neck. These conditions are classified as properties of cervical radiculopathy.
Farther reading about other possible conditions that cause such tingling feeling, or for more details about cervical radiculopathy, including possible treatments, can be found at the following links:
http://www.spine-health.com/conditions/neck-pain/what-cervical-radiculopathy
http://www.healthhype.com/arm-numbness-tingling-hands-and-fingers.html