Hi, Welcome to Health care magic forum.
The pain in the lower left back portion may be due to the
arthritis of the ileo sacral joint, or hip joint. It may also be the stone in the
ureter near the bladder.
I advise you to consult an orthopedic surgeon for diagnosis and treatment. You may need to have an M.R.I. for diagnosis.
Avoid taking potato, other tubers, tomato, egg, chicken, and sea foods till the pain is relieved.
Take more of green leafy vegetables, pulses, sprouts,and
protein rich foods to hasten the recovery.
Wishing for a quick and complete recovery. Thank you.