Strained ligaments lower back from repetitive bending/twisting at work. im modifying what im doing. if i continue to work can this become permanent?

Possibly: It is possible that if you continue to strain your lower back. Then yes over time this could become permanent. You could speak to an occupational therapist in regards to techniques to help prevent this strain while at the same time keep your job. Since your Canadian go to your regular doctor to be referred to a good occupational therapist.