hello doctor, I ve had this constant pain in my lower back region for some time now, it does nt affect my everyday activities put its painful when i move or twist my body,i ve had an x-tray in the past put they said it didn t show anything,i m 38, normal/average wieght, eat well and moderately active but it s been really upsetting to know that this pain wont go away.....what do you think it might be