I'm lucky Thomas, my doctor is also a friend we talk a couple of times a week about everything. He also reads as much as time allows and keeps up with the latest. Nothing is ever off the table. I trust him and he trusts me. He did get a little pissed off at my vitamin D levels a few months ago when it was in the NIH overdose range. After talking he is taking a different view of vitamin levels. So do you plan on attacking vitamin D now. Oh wait you tried and failed!
FM1 - these things are not about battle nor attack. Your doctor - I am sure - realises that none of these things are certain. He will sensibly give patients quite a say in their treatment as long as that is not in his view dangerous.
I bet, though, that he has been strongly counselling you to be fully vaccinated, if that is possible, and if not to exercise good biosecurity measures!
Re vit D. That one Spanish RCT which I like really does seem not to have been properly conducted. The lack of followup is resounding. So current evidence remains negative for vit D as a cure for anything - except obviously you want to keep levels of vit D in normal range. for many pople without supplements they are too low.