I have been dealing with some kind of lower back pain with radiating pain (left leg first, now deep in buttocks) for 3 months now. Was on Lortab 10mg and Zanaflex for most of it, now my doctor is switching me to Ultram and Amrix. Problem is, Ultram and Amrix are not mixable due to increased seizures. Any advice? She's been great up til' now, but seems concerned about addiction. MRI was clear. But problem persists. Had an injection into SI joint 3 weeks ago.