As I saw ur MRI report there is no evidence of disc buldge or any other disc related issue n neureurological deficit , and I saw ur doctor prescription, he has advised postural correction , n U r MRI report suggests straight spine an d it could be due to muscle spasm
Next Steps
U should do whole back n core strengthening exercises n stretching exercise for ur a back n legs so that u can correct Ur posture and u can do some blood tests like vitD3 vitB12,and
Health Tips
hot formantation and exercises continue under supervision of a Physio n probably u can take another ortho opinion , because MRI show no evidence of pain , so u need to be assessed physically by some expert doctor near by ur area , n do not sit for long hours