Back. Stretching exercises might help.
I've had lower back strain from work for 8 months from bending/twisting. With rest gets better. Could this be permanent even after stopping my job?
I think not! If the pain gets better with rest, that's a good sign. If, when you stop this job, you don't engage in any other activity that's hard on your back, you're likely to be okay. Go to mayoclinic. Org--Patient Care & Health Information--Diseases & Conditions--B==Back Pain for advice on preventing & managing this common problem. Best wishes!