Thank you for your concern but I stay far away from doctors even though I did spend the first 18 years of my life living with one.
About 10-15 years ago someone regularly posted threads about Vit. D3 studies, dozens of them for multiple suspected benefits, and many of them were based on intakes far beyond 15,000 IUs per day. The safe upper limits were very high.
I am a huge proponent of vit D WITH k2...but...people are different...you really should test...you can get it done without a doc...
PS...I take 8-10,000 a day with K, depending on season, to maintain @level of 60+ (level s/b between 60-80)