True Blood Injury Phobia/Fear of Passing out?

Hi guys,

I have suffered with odd and anxiety since childhood. In march 2017, I suffered from extreme antenatal depression and got on zoloft, but relapsed after the birth of my child. When I got ill, my thoughts became extremely irrational due to my fear of fainting. I think I am going through a bout of medical student syndrome, as I am a licensed psychotherapist. Now, I know that it's very rare to pass out from an anxiety attack bc blood pressure rises, and it needs to decrease in order for this to happen. The problem is that now, having so much knowledge, I wonder if I can pass out from seeing someone be sick, from getting a haircut (if mind interprets it as a needle) from a blood test, etc. The thoughts go on and on and on. Based on my own diagnosis, I feel I am suffering from a pretty severe case of odd (irrational thoughts fueled by obsessions to quell the anxiety). I am always questioning my sanity, drinking/eating sugar so I do not pass out, and checking my pulse to make sure it is not dropping. How can I be sure I do not have a blood injury phobia? Again, I have never passed out but is fear alone sufficient enough for a fainting spell to occur in the presence of blood and injury phobias? Thanks so much for your help.

Thank you very much. I have a great therapist, and may need a higher dose/switch of meds. However, worried to change them due to the very unpleasant side effects.