It may be due to lumber problem like oestiophytes in lumber vertebrae or slip disc?
Please get an x-ray done of lumber spine first.
Do some spinal extension exercises.
Next Steps
Avoid jerky movements and forward bending for now, apply Rhumasyl oil for gental massage on pain areas for now
Health Tips
After x-ray get lumber traction at physiotherapy clinic for 15 days.
Thank you