It seems like I'm deficient in antidiuretic hormone or vasopressin.
What is your cortisol level like? Have your read the following two papers.
https://onlinelibrary.wiley.com/doi/full/10.1111/joim.12649
Vasopressin regulates renal calcium excretion in humans
You need further investigation - 24 hr urinary tests monitoring calcium etc., to decipher exactly what your status is. You may need to work with an endocrinologist as your GP may not be able to do the required testing. I don't how your medical system works in Manilla.
Is your vitamin D level in the good range and do you do muscle work? Do you spend time in the sun?
This brings us back to PTH and aldosterone - also inflammatory markers.
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