I made an xray on my back and left leg, What does this mean? 'straightening of the lumbar lordosis reflecting muscle spasm'

Muscle spasm. The term lordosis refers to the normal inward curvature of the lumbar spine the lower part of your spinee. So that curve is now straight because your muscles are in spasm. Try muscle relaxers and NSAIDS to start to get some relief. The curve will come back.
Not much. Common benign non specific finding if that is all they had to say about your xray no bony abnormalities, be reassured not anxious, no arthritis no fractures no scoliosis.