Hello sir,
You should be meeting an Ortho surgeon for this problem. It could be 2 possibilities, one is lower back nerve root compression leading to pain or other is vascular compromise leading to pain. Symptoms you're saying are more pertaining to vascular compromise. You need thorough evaluation of this so meet orthopaedic surgeon ASAP.
Next Steps
As of now you can use this tablet for mild relief - Tab Pregabalin 75 mg to be taken at bedtime.
Health Tips
Avoid squatting, using indian toilet, sitting cross legged, bending, lifting weights. All the best we're all with you.