question: I am 47, 53 and weigh 14 stone, I work as a primary school teacher.  I have had back pain on and off for many years, this has escalated since January to the point of constant pain to the left of my back, severe pain through my left buttock and down my left leg.  I am now struggling to teach, i find it difficult to sit, stand or walk for periods of more than a few minutes.  Also the pain is worsened when i bear down to go to the toilet.  My sleep is disrupted by the pain.  Anti inflammatory pain killer helps but wont cure, what can you suggest?  I have not made time to see my GP, but now feeling the need to seek help.