I recently near fainted when having blood drawn for my normal thyroid labs that I complete every 4 months. This has never bothered me before. My oxygen was 86. Is this any indication that I will be likely to nearly faint or actually faint in the future. Now I'm trying to avoid my next check up. The lab tech was concerned it was her fault because she moved needle while it was in my arm in order to get blood to come out. I am a hard draw anyway. Tiny veins.