Hello,
Since you have high calcium levels in your blood, do not take 
calcium supplements. Avoid food rich in calcium like bananas, yogurt, cheese, milk, ice creams.
High calcium levels may cause 
kidney stones, weaken bones, may interfere with the heart & bran function.
Cancer can cause high level of calcium in the blood due to bone breakdown. 
You are suggested to get physically examined by a GP, get all the blood and imaging tests done to detect 
multiple myeloma, 
leukemia or overactive 
parathyroid gland to stay on the safer side.
Your treatment will depend upon the pathology detected.
Hope I have answered your question. Let me know if I can assist you further.
Regards,
Dr. Nupur K, General & Family Physician