You are not alone. I have to give presentations every week over zoom and lately I have been having more blockages. For me having my camera off helps me reduce the anxiety because that way the other person doesn’t know when I stutter (my stutter is blockage instead of repetitions) so when I stutter my boss thinks something is going on with my wifi connection 😂 and she will be like “hey I didn’t hear anything you froze” and just have to pretend it was that and repeat everything again.🤷🏽‍♀️