Hello and welcome
Good to listen that your X-rays are normal. It seems to have soft tissue injury
that takes few days for healing. Follow some precautions:
1. Take complete bed rest
2. Do hot and cold
fermentation at the back.
3. Apply local anti-inflammatory get gently at the paining site.
4. Take analgesic
and anti-inflammatory drugs to reduce pain.
5. Restrict the movements of your back and avoid all jerky movements of the spine.
If your pain reduce in 2-3 days than continue the precautions but if your pain increases and become worsen than consult your doctor and you may need MRI scan to rule out any ligament or nerve injury