I Had Lower Back Surgery 4 Years Ago. There Was

I had lower back surgery 4 years ago. There was a fusion with rods and screws. The pain in my legs immediately went away but my back has hurt everyday since. I have had numerous injections, physical therapy, massage, acupuncture. I was told it was just muscle so I joined a gym. It did not make it worse but did not make it better. When I sit in a chair or lay in bed the pain comes back instantly. Driving in my car does not hurt or my chair at work but if drive in another car I am in so much pain. Could it be the screws causing the pain since only certain things set it off and other times it is okay? What do you know about hardware removal?