Hi Silver,
Welcome to the forum.
To start with a bit of info, the four classic symptoms are:
– hyperCalcaemia (high levels of calcium in the blood).
– Renal failure (kidneys stop working).
– Anaemia
– Bone pain.
They are known as CRAB for short.
In your mum’s case, the cancer cells have taken calcium from the bones, which has leached into the blood (hypercalcaemia), which ovrrloads the kidneys (renal failure).
The chemo that your mum is on (which is more or less standard) should kill off a lot of cancer cells relatively quickly, which would deal with the hypercalcaemia and let her kidneys recover.
Although I am only a layperson, I went through this around the time of diagnosis.
You don’t mention bone issues (pain or fractures) and you say that she was doing regular exercise. In those circumstances, I would suggest encouraging her to exercise as best she can, when she can, rather than conserving her energy. It is really tough doing this, but the rewards in terms of both physical and mental health can be enormous.
She can get through this and so can you.
Having myeloma, and caring for someone with myeloma, can be hellish, but most of us on this forum know what it is like and can give lots of support and advice.
Regards
Rabbit