Hi Liz
While I can see that everyone on this discussion forum is so very helpful and supportive, I would say to always contact the nurse/doctor at the hospital when you have concerns. They're there for you as well as the patient. I think in many ways it's harder being the carer.
I have had a couple of uneasy moments when I've been able to call and get reassurance or an explanation for things that I've experienced, like the leg pain you mention. At the Nottingham hospital, they give out a phone number, bleep and pager so patients can contact someone at any time. I really think asking the medics is a better route than asking the patients. And knowing you can call at any time means you don't always feel you have to.
As for broken bones and fractures, when I started on the Myeloma XI trial, they did a full skeletal survey, i.e. x-rays head to toe. From those they could determine my risk of further breakages. Even though I fell off my bike last week, I had been told that the risk of breaks/fractures was the same as a "normal" (non-myeloma) person. Knowing that, I didn't worry too much when I fell. It might be worth finding out what your husband's fracture risk is, if they know. That might help put one bit of worry to the side.
I hope the pain goes soon and you get some useful answers.
Good luck
Jet