question: I felt a pain in my lower left back yesterday as I was sitting at my desk. The pain gradually got worse throughout the day and by home time, after having sat at my desk for most of the day I felt that the left hand side of my back was caving in on me. During the evening the pain spread to cover the whole of my mid to lower left backand then I felt these weird movements like something throbbing, tingling, pulsing inside? They came and went like contractions but my back still ached all the time. I couldn t sleep on my left or right side as my back wouldn t support the weight on the left side. Today has been terrible, the contraction like movements are still happening, I can t sit comfortably and I can t move or walk about freely. I now also feel that it is restricting my breathing because it is very painful when I take deep breaths. Can you tell me what this is and how I can relieve it please?