Thanks for posting your query
From description it seems you might suffering from neurogenic claudication due to lumber spinal stenosis
Get a MRI
of lower spine done to see the severity of stenosis at level of l5.
Best couse of treatment for you to get started from conservative treatment (physical therapy
). If conservative treatment not works, consult a spine surgeon
for thorough examination and further managenment.
Hope this Will helps you.
Dr Saurabh Gupta