I have a back problem that is steadily getting worse. I m 56 years old. I have osteoporosis. I started out seeing a orthopedic doctor for arthritic knee pain then the opposite knee then up my leg into my hip and then into my lower back. Now it s hard to sit for long stand for long either. Unbearable pain at times. Legs swell and feet tingle and go numb. Hands go numb and tingle. Am taking 600mg gabapentin 3x a day. Doesn t help that much. What could be wrong