Your symptoms are typically pointing to words a slipped disc or a prolapsed intervertebral disc. The abnormal posture is called a sciatic list. The likely reason for this episode has been a chronic bad posture and no exercise for toning your back muscles. There has to be a history of low backache since long time which was unaddressed. Please get an MRI done of lumbosacral spine. Take muscle relaxant tablets and anti-inflammatory along with neuro-sedative Medicines as per your orthopaedic consultation. Strict bed rest for three days and hot water fomentation to continue thrice daily.