Greetings, sorry about the pain. Your problem seems to be one of a poor flexibility at your back. Disc problem in itself due to poor flexibility between hips and thigh (low back). Not to be worried about disc, take a weeks off from work for now, through away pain killers.
Next Steps
hire a physio as your trainer for 3 months and get yourself the best chance to cure it permanently. physiotherapists normally would do trigger point therapy plus core strength training to improve your flexibility.
Health Tips
if any questions do let me know. your recover is guaranteed by this approach. if for various reasons unable to get it cured do let me know will assist.