Feels like something is torn

Patient: A few months ago I was in a auto accident a few weeks later I started getting a really sharp pain in the left side of my back upper between the shoulder blade and the spine it will feel like someone is grabbing it and twisting to the point were it effects my breathing I have to take really short breaths for about two to three minutes until it lets up. what causes this to happen?

Symptoms: twisting in the upper part of the back shortness of breath.