Give it time. Low back pain usually improves within 1-2 weeks, but it depends on the circumstances. If your pain has persisted for greater than 1-2 weeks despite conservative management I would see your physician. You would also want to see your physician sooner if you have any fever, chills, night sweats, or bowel/bladder changes.
Depends. Get a thorough evaluation by a reputable chronic pain specialist (not a surgeon as the first line of attack). Find out specifically what is causing the pain then treat it. Do not mask the pain with medications since that will not enhance your life, but rather treat the root cuase with as minimally invasive treatment as is possible. Start the journey today.