Could it be circulation? I took gabapentin for 6 months but I do not remember if affected circulation or not. But I do have the problem of cold/swollen limbs - my case it is my hands and forearms. My neuro says that when my pain increases in my arms, my body will react and will decrease circulation to area that is in pain and therefore cause the increase inswelling and cold chill/freezing feeling. Perhaps your body is reacting in a similar manner. I don't know? Sorry your so bad off. Wishing I had more to offer.