These symptoms are suggesting that you may be having a disc prolapsed at lumbar region . I would recommend you to get MRI of the spine to see if there is a disc protrusion
and if yes then how much . According to that you can plan . If it is in early stage then treatment will be physiotherapy
and muscle relaxant
and Methylcobal.If it is in late stages then surgery is needed. Till that time, avoid bending forward and weight lifting.