hi, thank-you for providing the brief history of you. as you mentioned that you had certain pain and for which you have done all test in 2005 and all reports were normal. Now back again after 7 years the pain is same but the nature of pain is weakness, pain, tingling , numbing etc?? if that is the case you need to get an MRI of the lumbar spine done to see a soft tissue Injury. As age progress the spine becomes weaker and this tends to apply pressure on the nerves, which will lead to all such symptoms. Also, you can use the hot water fermentation for relaxing the muscles. I suspect it that you had a mild nerve irritation in the past but it was never traced by diagnostics. You should have opted that time only spinal Strengthening exercises. well now it s 7 years so let s look ahead to solve this mysteries pain. Focus on doing some small lower limb strengthening exercises like static quadriceps and hamstring, ankle toe movements. Along with this kindly perform some deep breathing exercises as breathing exercises plays an important role while any activity. Also post this you can proceed onto the straight leg raise as within 2 weeks of Static quadriceps and hamstring the muscle will be strong enough to perfrom SLR. Post this again With a week or so you can start doing core stability and spine Strengthening exercises. and I am sure you won t find much pain. Sometimes the nerve is getting trapped but the scans turns normal. for this reason all diagnostic reports are mentioned - this is not an actual diagnosis and kindly correlate with clinical symptoms. Well by performing this exercises you will be fine in 6-12 weeks. But even after the pain is gone kindly make a note to perform in regular basis as the spine is important. with the grace of God I wish you a speedy recovery regards