Had serva from flu vaccine in 2014 and now my symptoms have reappeared. Same pain in neck, shoulder, and arm. Dull pain in arm, burning pain at times. Cannot sleep from discomfort, and also when active pain gets worse. I was treated with Gabapentin in 2015 and after two months my pain was gone. How could this happen, that my symptoms would come back. I still had a new, unexpired bottle of Gabapentin and I started taking them again. Why did my symptoms come back? If I get no relief after one month, then I will consult a physician. What do you recommend?