I swell and sometimes it is worse then other times. I also am on neurontin but the swelling started before and really varies so much. I am not saying it is not from the neurontin in your case or mine actually but just my experience. Some days I just swell more for no reason but when I am more active,the weather is more humid,and also when my pain is higher I seem to swell. Though when my pain is higher I am not sure if the swelling is causing higher pain or the pain is causing more swelling.
I agree about telling your doctor. I always state any changes even if it is small which swelling is not but in general I am speaking
EE I always have a list of what I need to talk to my doctors about so that I don't forget or get distracted when at the apt.