Hello there.
You need to rest your body first. Lower back muscles are one of the breathing muscles group. So, when sneeze, you are contracting those muscles and it leads to more pain. If there is lot of stiffness with spasm, apply ice. Hot water fermentation if only pain.
Next Steps
Visit a nearby Physiotherapy Clinic and get IFT and Ultrasound therapies done for 5 days.
Health Tips
Limiting your activities of daily living can speed up your recovery process.
Avoid bending forward, gym, athletic activities, prolong time sitting and standing.