Hi Mary
We have lovely nurses on this site Ellen and Maggie,the number is at the top of the page plus it’s free,talk to them,they can send you booklet plus give you lots of information.
When someone is first diagnosed,it’s very hard to take in all the information,I had never heard of Myeloma,try not to go looking on the net until you can have your information clarified by the nurses on hear,they are lovely people who can help you.
Back pain is a symptom of many things,to reply to your question we would need more information. Eve