Thanks for writing in.
Schmorl's node are nothing but disc protrusions inside your vertebral
bodies. They are benign and usually don't cause any problems. After reading your MRI
it seems there doesn't seems to be any significant findings. Small / tiny disc protrusions might be present for all individuals. Since there is no canal or foraminal stenosis, the pain is not a neurogenic / discogenic pain. Your MRI also didnt comment anything abnormal in your sacro-iliac joints.
at L5/S1 or any other levels can be missed by MRI. After a thorough clinical examination, you might need to undergo stress
views of your spine +/- CT at the levels to rule-out any instability of segment or spondylolysis.
Till that time you can wear lumbo-sacral belt, back strengthening exercises, lying on hard bed etc.. Avoid leaning forward, sitting /standing in same posture for longer periods, lifting heavy weights.