I finished 1 year course of Pegylated Interfurion (Hep C), now 2 x wk injection Epogen & Nupogen 1 x wk. I 1/2 month ago I experienced severe swelling of my calf & leg, accompanied by cramping of the foot, pain and unable to walk for 3 days. Now July 7 for last two weeks experiencing numbing and burning sensation to my right upper arm (from under arm up half way to almost top of shoulder.) Could this be because of drug interaction or side effect of one of the drugs?