Pain in the lower back, pain in the left leg. I have many questions to ask, first: I have a problem of constipation that lasts about a year, I have taken laxatives, prunes, coffee ...

I would recommend you see a surgeon . You probably have a herniated disc that is pinching the nerves in the back causing sciatica. Treatment includes rest, physical therapy , anti-inflammatory , palliative medicine , injections and surgery. Today herniated discs can be arranged with very safe and minimally invasive operations. The cut is a minimal incision , the pain quickly disappears one hour after the procedure you're going home. Visit a doctor for your constipation problems.