Hi Susie
Sorry in my late reply and am sorry I cant help as so far i have a little bit of back pain but its (or so am told) arthritis ??? am sure your bloods will tell your Consultant if the Myeloma has kicked in and my advice would be to talk to him or his secretary and ask for more bloods to be taken and let them have a look.
Good Luck and I hope you stay as you are for years and not need treatment
Tom Onwards and Upwards xx