Sarah
I think it might be paravertebral musle spasm
causing this pain
another possibility is a disc problem of your lumbar spines
wait and follow up the symptoms
inform me for possible advise according to the progress of your symptoms
good luck dear
yesterday my all leg was numb i could not feel it for a long time i tried to walk on it but still i could not feel it
you should go for lumar spines' MRI Sarah