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1.There is a disc between the
vertebral bodies helps as a
shock absorber effect, the disc contains maximum percentage of water, due to degenerative changes when the water content / hydration is lost the disc slips / bulges.
2.At the level of L2-5 there is a disc bulge and causing pressure effect on the
nerve room and spinal chord.
3.All the symptoms mentioned by you are seen in this condition.
4.The treatment is simple back exercises and
physiotherapy, finally if does not help an interventional / operative is the treatment of choice - but in your case exercise will help.
5.Few exercises recommended from NHS UK you can try the link.
http://www.nhs.uk/Livewell/Backpain/Pages/low-back-pain-exercises.aspx
Hope i have answered your query,
any thing to ask do not hesitate to ask.
http://doctor.healthcaremagic.com/doctors/dr-ganesh/62888