Suggest Treatment For Chronic Lower Back Pain

I have been suffering with chronic low back pain that doesn t ease with pain killers or change of position. It makes me feel as though I need to pass stool when I don t. I have also been ongoing suffering with pain in leg bones, weakness, fatigue, abdominal pains, slight dizziness, nausea, loss of appetite, these symptoms are always present but some days flare up more than others, I have become depressed from it and now noticed tiny red dots on my skin. My GP seems less than interested!! This is effecting my working life, day to day activities and hobbies. I m silently wanting to scream all the time. Any ideas what this may be? Is it unreasonable to go to a&e? Many thanks