Several 10.000 a day for months.

That's really excessive. In my country, the standard of care for low Vit D is a bolus dose of 60,000 IU once a week for a month, and then switching the 60K IU dose to once a month.

I half believed those pills from amazon were fake pressed inert dust and lacked the knowledge I have now.

So you were assuming it was under dosed?

No I was just dumb and not thinking too much at all.

Any high or non-sane vitamind D dosages should be accompanied by regular blood tests.