Looks like you are having back pain which radiates down the legs but your MRI looks fine.. It must be a simple /mechanical back pain.. You can consult me with your complete presentation of pain so that I can help you manage it on your own.
Next Steps
Take rest, apply ice packs on the affected area, correct your posture, if doesn't resolve in 2-3 days, consult with a good physiotherapist near you
Health Tips
Don't lift heavy weights, don't ride for long distance, don't sit for more than half an hour at one place.. take breaks..