Back pain

Anyone else experiencing back pain from top of ribs to lower back? I take the train to work and have to walk about 9 blocks and then I sit at my desk. I'm free to get up and move around but by the time I get to work I'm hurting already. I'm very grateful that I don't have to stand for 8 hours but it's still very uncomfortable. It almost feels like my muscles are bruised. Anyone have any ideas for relief? I'm going to try a heating pad tonight at home but I can't use it 24/7.