The symptoms you have experienced are consistent with a compression of the nerve roots going from the spinal cord to the left leg. This is usually caused by a herniated disc in the lower back area. However, other things can also cause nerve root compression.
Without symptoms in the lower leg, bowel or bladder symptoms, the spinal cord is probably not affected, although if you developed these symptoms, or progressive weakness of the legs, you should see a doctor urgently
Testing would include an MRI of the lower back to visualize the pinched nerves, and/or an electrical study (EMG) to determine how affected the nerves are by the compression. Surgery may or may not be required, depending on these results.
You need to get this testing as soon as you can in order to avoid any further injury
Good luck