Hi.
It probably looks like you are having an acute strain of your low back.
Most probably a muscle spasm.
Get an X ray of lower spine.
Anti-inflammatory and muscle relaxant should help.
Do hot water bag application and bed rest.
Next Steps
Consultation with Orthopaedic doctor and an X-ray
Health Tips
Hot water bag application.
Avoid massage and exercise.
Avoid traveling and forward bending.
You will do well.
Take care.