In the middle of my back towards my right shoulder blade it feels like a buildup of air that will build, then pop and build up again in minutes ?

Muscle spasm: Muscle spasms or localized pain in the soft tissue called a trigger point can cause similar symptoms you are describing. If you were having other pulmonary symptoms like bronchitis or other infections could cause pleurisy which less likely would cause your symptoms. For now use local heat particularly hot showers and if you can take them some over the counter advil or aleve may help.