Hello,
Sorry to hear you are worried about your calcium issues.
I have the opposite to you i don't have enough calcium in my blood due to my parathyroids not working.
Please try not to worry you will feel so much better when they locate your naughty parathyroid ...they will remove it and all will be well again.
I have had thyroid scans with the dye, it was no problem no worse than a blood test the worst part was keeping still whilst they did the scan...they need to do this to locate the right gland out of 4.
Blood tests are needed to check your PTH and calcium levels and kidney function, urine tests to see how much calcium you are weeing out and also calcium will be leaking out of your bones that's why you need the bone density scan.
All this is reversible and you will feel so much better ..you must be having some horrible symptoms?... Calcium issues are not nice whether too much or not enough .
My calcium is low tonight so I am feeling shivery tingly and it causes anxiety with crazy heart palps, also cramps.
Sometimes my calcium will go high if I need a medication adjustment then I feel bone pain ,headaches constipation and nausea, and depression.
Good luck and I know how you feel ..try not to worry xx