Referring to the data you reported (persistent lower back pain which started after giving birth, sometimes down left leg, left leg looks like it is asleep, tingles and needles on fingers of right leg), it seems likely that you might be experiencing lower back pain due to spinal problems. It cannot be determined for sure what the exact spine condition that causes your pain is, but it most probably puts pressure on the nerves leaving the spine in the lumbar area. The pressure lasted so long that it might have even caused minor damage to the nerves (changing in the sensory).
You might want to ask an orthopedist for another opinion. Imaging methods (X-ray, CT-scan or MRI) might be recommended to try to detect the condition. The pain might originate from a lumbar disc hernia, spondylolisthesis, or another spine issue.
Depending on the results and the current condition of the vertebrae, a surgery might be recommended to try to align the vertebrae. Other than this, pain management is recommended to try to ease the pain.
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