I’m so sorry that happened but it got you an early diagnosis-somewhat similarly, I fractured 2 vertebrae (compression) while skiing & discovered osteoporosis and MGUS. I’m 64 & “healthy “.
I know exactly how you are feeling. Be patient and get to someone who specializes specifically in blood disorders, specifically MGUS and multiple myeloma etc. preferably in a research or teaching hospital with an active clinical practice in that.
It’s a complex disorder & new drugs & therapies are being developed at a rapid pace. Osteoporosis co-occurs with MGUS frequently and can be treated!
I was able to start treatment for that which helped me avoid any other fractures- but no
More snow skiing unfortunately.

Do what you need to do to get adequate sleep while you wait for the appointment. Learn a bit about MGUS but try not to google stuff. I did and most of what I found was discouraging and out of date!
As a retired RN I am my own worst enemy…