Low back pain x 5 weeks. pain when turning over in bed and when first sitting up in the morning. once up it gets about 80% better. started after wearing heeled shoes and standing for 3 hours in them. (normally wear flats). what could it be?

This low back discomfort may be a strain or due to osteoarthritis of the spine. The latter may be worse in the morning & improves after being up and around as opposed to entities like spinal stenosis or compression fracture of a vertebra. A herniated intervertebral disc in the lower spine usually causes radiation of pain in the buttock &down one leg. A physician or orthopedic specialist can check