Hi friend,
Welcome to Health Care Magic
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...
Take care
Wishing speedy recovery
God bless
Good luck