My father have sciatic pain which started in his lower back and has now shifted to one leg's calf, he can't straighten his leg and walk properly because of severe pain, he had similar pain 3 years ago when he had l4-l5 herniation and had surgery. The doctor's on initial diagnosis diagnosed a back spasm, and gave meds, but the pain is getting worsen, what should be done? Also I noticed a small lump like bulge in his lower left back, should I be worried?