Since when is this happening? Are you over weight? Do you smoke? Take alcohol? Any past medical/surgical history?
This seems to be pinched nerves in the back which gives off and on pain in the distribution of the sciatic nerve in the lower limb. You need a MRI to substantiate it. The specialists to deal with this disorder are either an orthopedist or a physiatrist (MD in physical medicine and rehabilitation). The mainstay of the treatment is physical therapy. Read here;
Please feel free for your follow up questions.
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The link do not give exhaustive list of the manifestations and symptom complex. All of your symptoms do corroborate to the pinched nerves. If this is ruled out, you physician may get an estimation of serum B 12 levels.
To conform the diagnosis of pinched nerves, other investigations are neurophysiological function studies like nerve conduction study and electromyography (NCV and EMG).