Since your current anti-inflammatory and muscle relaxant treatment has not provided relief, please consult your prescribing doctor for a reassessment. They may consider alternative medications, such as different non-steroidal anti-inflammatory drugs (NSAIDs) or gabapentinoids if nerve irritation is suspected. For long-term recovery, physical therapy is highly effective to strengthen your back and improve posture. Simple lifestyle adjustments can also help: use a lumbar support cushion while driving, take short stretching breaks every hour, and apply warm compresses to relax the muscles. Rest assured, back pain from prolonged sitting is very common and highly treatable with the right physical therapy and ergonomic adjustments.