I took Xeloda for six months and yes I had joint aches throughout. It affected my hips, knees and my feet. The longer I was on it the more it was a problem. I took B6 and it helped and I could always tell when I missed a dose. So I tried not to be lazy about it, but sometimes I was. I was very active throughout my Xeloda treatments....didn't let the ache's stop me from walking, bike riding, swimming, etc.
It took a good 4 months to get back to normal after finishing the protocol. I am happy to say though, I feel great now. Hang in there and ask your doc if it really is holding you back.
Prayers coming your way!