Thank you very much for the useful information Gary.
There are certain important problems that can be responsible for the symptoms you have.
First, this can be vitamin D deficiency, although you have been taking vitamin d supplements but until you get your vitamin d levels checked, one can not be sure whether you were taking enough vitamin d to replace the deficient body stores or not.
In certain kind of vitamin d deficiency states, an activated form of vitamin d has to be taken to work effectively. Yes, its deficiency can cause the generalized aches and pains you had, and for this we need to screen you.
Then i could be a hidden malignancy (cancer) which if gets spread can lead to wide spread body aches and pains, so some initial screening blood tests, chest x-ray and abdominal ultrasound will help rule out this possibility.
Raised calcium levels (either due to a metastatic cancer, or due to other endocrine pathologies) can also give you similar wide spread pains, and typically increase your thirst.
Finally, it can be from fibromyalgia, a functional disorder where one can feel these tender and painful points in the body along with fatigue. This is a diagnosis of exclusion which simply means that all other potential causes for these symptoms need to be ruled out first before attributing these to fibromyalgia.
And i must not forget to mention that you should also get screened for thyroid disorder (TSH levels); as this can also present clinically in a similar way especially if you are over weight, fatigued, and feel depressed.
So you should see an internist soon, and discuss all the details i have mentioned to get further management plan chalked out at earliest.
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