After 3 years of lower back pain radiating to right thight was said its piriformis syndrome and got injection but no result. pain comes after standing/bending etc,sometimes goes away.had pt,painkillers, mri and x-rays are normal. how bad can it be?

It appears that you had a thorough evaluation. I wonder if your PT was sufficient & included adequate stretching and massage to relax the piriformis. Did you see a pain management specialist? Perhaps a second opinion at a spine clinic to determine whether piriformis syndrome is the cause.of your symptoms may be worthwhile. Bring your MRI,xrays & other records with you if you go to the clinic.