Hi, Welcome to HealthcareMagic Forum.
You may be having Lumbar Spondylosis
or Slipped Disc
. It has to be confirmed via MRI
. Until the cause is found out and treated, symptomatic treatment will not help. Kindly consult a Orthopedist at the earliest. Get adequate rest and if you are over weight, you should be reducing it by regular exercises. You may need Physiotherapy
Wish you Good Health.