Alice, That side effect can come from Aranesp or the like. Did you recently have one of those injections? You can read my experience w/Herceptin in my signature. Been on it since '98 -- almost 9 yrs. Fatigue, which may or may not be from Vit H, could be leftover shock and awe chemo or just me getting older, is my major side effect from Herceptin.
It keeps me well and stable, and I can live w/pretty good QOL on it. Let us know how you do, please. We all care and want to help if we can.
It's so hard not to panic with new symptoms when you are in our position, but once I can find logical explanations I'm good. When I had the major pain you refer to (from my neck down to the base of my spine) my husband mentioned about Procrit (which was the red bld booster I was then on) and it's possible side effects. I thought I was dying for sure, then I settled down. Hope this is all it is w/you.
Andi