The filigrastan affects the bone marrow and encourages the production of white blood cells, so the pain is a known SE. My nurse told me to walk, so I did and it was definitely an improvement. Plus the fresh air was helpful in keeping my hot flushes down, and the scenery gave me something else to think about . X
Although I didn’t have bone pain it is quite a common side effect of having these injections. I have had these injections on a number of occasions depending on the type of chemo I have been on. I think it should pass so hopefully you won’t experiemce it for too long.