I was stretching this morning, went for a short run/walk, biked about 2 miles and when I was walking I started feeling this sharp pain in my middle back just under my shoulder blades.  It last about 2 seconds and sort of takes my breathe away. I noticed it happens when I bend sideways or sway
Hello, I had gone through the case and found that it might be nerve trapped which causes pain. So take mild painkiller and apply muscle relaxant gel. Avoid exercise and bending forward. Hope my answer will be effective for you. Thanks