I suppose blood pressure must have also been thoroughly checked?
Me: Nothing even vaguely resembling a medical professional, but when I was having very near passing out episodes multiple times daily, I put 2+2 together and realized the CoQ10 component of the D3 regimen is a known blood pressure reducer, so I went off of it and haven't had another pass-out episode since (close to a year).
I'm not aware of passing out episodes being an actual cluster related sign or symptom.