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Taking calcium can not cause pain!
Surgery ought to have removed the cause of pain!
You have not stated your personal habits, family history, or co-morbidities, even age ...which could influence the diagnosis and outcome...
You may need further investigation – like CT scan
of abdomen and Lumbo-sacral spine / Colonoscopy
Degenerative disease of the spine causing nerve root
irritation / malignancy and so on have to be ruled out
Over The Counter (OTC) Non Steroidal Anti Inflammatory Drugs (NSAID) / muscle relaxants / anxiolytics will be useful in the meanwhile...
Some anti-depressants (SSRI / SNRI) and anti-epileptics (like gabapentin
) elevate the pain threshold and could be useful – even in the absence of depression
If there are no pointers still, psychological assessment and assistance can help...
Discuss with your doctor...
Wishing speedy recovery