D3 is a great idea.
For the flu it’s best to not take aspirin, ibuprofen, or acetaminophen as those bring the fever down.
Having a fever keeps the virus from replicating, and in turn reduces the subsequent complications due to the cytokine storm.
Apparently you have never gone above 105.
No, not all fevers are OK. Getting too hot is very bad, maybe indicative of a losing battle. And relieving some of the symptoms is not bad.
“D3 is a great idea.”
Yes, when taken with K2.