??Aches and pains while on herceptin alone

I started herceptin in June of '05 and will be on it for a year. Ive noticed since it started, I've had no bad side effects such as I had while on standard chemo. However, I have noticed increased general aches pains, and stiffness esp. in my joints-- hips, knees. feet, elbows and hands. At first I attributed these symtoms to the residual effects of Taxol, But I finshed my 4 rounds of Taxol in August of '04. I still do have some minor numbness on the tips of my fingers.
But the stiffness stuff has me stumped. Now I attrubute some of it to age related arthritis ( I'm 65 ) though I've never had arthritis pre cancer and treatment. ( dx. 3/04 )
I'm wondering if any of these symptoms are related to the herceptin-- my onc. really doesn't know or comment on it.
Curious to know if others have had the same experience.
Carol