Thank you very much for this information. When I visited Sjogren's Advocate, I learned I probably don't have Sjogren's after all because my blood test was only positive for the B antibody. Thank you for helping me discover this important information! My large fiber peripheral neuropathy is considerably worsened by sitting. The latest theory is that an inflamed piriformis muscle is pressing on my sciatic nerve. I'm hoping that is the case, because it would be fixable. For the nerve pain in my feet and calves, amitriptyline works better for me than gabapentin. I admire your courage in dealing with multiple medical conditions. I hope the neuromuscular specialist can help!