Infergen and stiff

I have been taking interferon,alfa-2B for 10 years, I take 3mu five days a week. This last batch number 5-10L-104, has caused swelling, major discomfort at all sites (legs) and my hands are so stiff I can't open twist off caps. My whole body aches, this is new compared to the usual symptoms, is anyone else having problems with this batch? I had problems a couple of years ago and found out what was in my syringe may not have been interferon but saline or water. It just started with this batch of medication and I'm wondering if it's just me or if anyone else has a problem. This batch expires july 06.