Hi David,
Top priority: please contact your doctor or healthcare team.
On this forum, we are not generally medically qualified. In particular, a blood pressure of 170/90 sounds sky high.
I have experience of zoledronic acid, also known as Zometa. For me, it caused flu like symptoms (not unusual) and temporary utter exhaustion (less common but not unknown).
What follows is from reading up, not personal experience…
The pain just above your pelvis could be coming from your kidneys. Myeloma can harm kidney function. Blood tests could indicate whether this is the cause.
You could be low on electrolytes: that would be consistent with being prescribed calcium tablets (calcium is an electrolyte).
All this is guesswork, though.
Regards
Rabbit