New to this page but not to health anxiety boards

My psy. dr is switching me from 175 zoloft to 80 prozac due to health OCD

I am cross tapering which terrifies me for Seratonin Syndrom! He reassured me he has been doing this 26 years and he has no concerns and that the only other way is for me to wean totally off zoloft which would not be good for my state of mind...

So this is the plan
Drop Zoloft by 50 mg each week while adding 20mg of prozac.

I'm so scared I will get SS and die. Please help me get over this fear with the real data out there and not scary google.