Sephie, your doctor has you on amounts of the supplements that are
greater than the
low levels which are addressed in the USPSTF recommendation. Sorry if I'm stating the obvious and you already know this, but the recommendation is not directed to you.
Their recommendation is based on the finding that:
In postmenopausal women, there is adequate evidence that daily supplementation with 400 IU of vitamin D3 combined with 1,000 mg of calcium carbonate has no effect on the incidence of osteoporotic fractures. However, there is inadequate evidence regarding the effect of higher doses of combined vitamin D and calcium supplementation on fracture incidence in postmenopausal women.
At the low levels, the supplements do more harm (significant increased heart attack risk) than good (essentially no good)...this "trade-off" is a no-brainer which the USPSTF seeks to communicate to women.
Heart attacks are often stereotyped as typically a "man's" health problem...but that's a myth. It is also a leading killer of women.
For the 55-64 age group in the US, as an example, coronary heart disease is essentially tied with lung cancer as the #1 cause of death of women. If you are not a smoker, lung cancer is obviously much less likely. 50% more women die of heart disease than the next leading cause, breast cancer. In the 65-74 age group, coronary heart disease jumps to the sole #1, and at 75+ the gap to the #2 is huge.