Hello Sharon,
Sorry to hear what your brother is going through and I know how you must be feeling. It would be difficult for anyone here to diagnose myeloma or not. It is good that the various test are being carried out and soon you guys will get a definite answer. What I would like to add is that MM is a very individual condition and no two patients are the same.
Please take it one day at a time and continue to provide the support to you brother. When I was diagnose I had none of the typical symptoms. But since diagnosis I have found out that my potassium, calcium, magnesium are all low, plus I am hypertensive. Now I am fatigued, shortness of breath, slight decrease in mobility and so on.
I was only diagnose in the summer.