I agree with de facto. Lumbar pain is very common and rarely an issue unless it prevents you doing your duties. Leaning back at funny angles might ring alarm bells if it is synonymous with leaning back for an overhead panel or leaning back to get a chart or tea tray.......
Not sure what species of doc you saw, but the definitive investigation is an MRI not an X ray. If a spinal surgeon cannot help after an MRI I would go see a chronic pain specialist. Your symptoms may warrant a standing MRI and may signify facet joint problems but this isn't an area for armchair diagnosis. So make sure you really can't be diagnosed or helped before putting up with your symptoms