I am anemic and my doctor prescribed procrit. Is this ok? I was reading on their website that it can make cancer worse among other things.

I fell on my tailbone in middle may. Xrays show nothing, but I am still experiencing middle back pain. My family doctor, specialist and now my chiropractor all say that it is the myeloma. I thought that was lower back pain. The pain is worse in the middle of the night, early morning. Once I get moving it is tolerable, but I am not able to do any normal activities, such as lifting, vacuuming, etc as this causes the pain to get worse. It is almost 3 months now, shouldn't this be healed or is it the myeloma?