This numbness is due to the nerve compression in the back region which increases as the compression. This pain and numbness generally occurs due to the disc bulge/muscular weakness /lumbar spondylosis.
Next Steps
Go to a physiotherapist.. Ultrasonic therapy +IFT +Heating therapy +some strengthening exercises will be helpful for sure .
Health Tips
At home.. Rest +hot water fomentation +pain killer gel +no long sitting /standing /travelling /walking +no stair climbing +no cold exposure +no manual exertions +weight lifting +correct posture (sit tall)