There are many reasons for such Backaches. It can be from simple de-conditioning of Back muscles due to lack of exercises, bad posture etc. to far more serious ones. We have to find Correct cause of your backache and have proper diagnosis.
Next Steps
Better to Consult to good Spine Doctor. I am Spine Surgeon for about 38 yrs, but treat 99% of my spine patients without Surgery. I have got my own Innovative methods to treat backaches.
Health Tips
When backache is heavy and for 6 months and you got limitations on your movements, you shouldn't pull it on. A Stitch in Time, saves Nine!