Hi Saif, Welcome to HealthcareMagic Forum.
Your History suggests you have Sciatica. It occurs, due to the compression of sciatic nerve
as a result of Herniated Disc
in the Lumbar Spine. The other causes could be, Lumbar Spinal Stenosis
, Degenerative Disc disease, Piriformis Muscle spasm
due to Prolonged sitting or car accidents, Piriformis muscle starts at your lower spine and connects to each thighbone on both sides, trauma, Spinal cord injury
or tumor. Kindly get yourself examined by a Orthopedist, so that he can examine you and Suggest a MRI Scan to rule out the exact cause.
There are various treatment options, like physiotherapy, Prescription Medications, steroid injections and surgery. Apply heat pads and cold packs regularly, and do some stretching exercises.
Stick to your treatment plan and go for regular follow up.
Wish you Good Health.