For what it's worth, this comment rings so familiar to me that I feel like I could've written it myself. I've read the normal speaking advice, am reasonably articulate, well-prepared, have good material (or which I like anyway), and am generally a decently well-adjusted human being, but I have a fairly severe physical reaction when it comes to public speaking. Every guide on the subject ever written talks about "everyone gets nervous" and to "imagine the room is full of friends"/"imagine everyone is naked"/"speak only to the back wall"/etc., but over the years I've realized that the type of nervous they're talking about and the type of nervous I'm talking about simply isn't on the same level.

A lot of people think that they get it, but I think that unless you have it, it's fairly difficult to understand. The result is a lot of very unhelpful advice online. Besides your comment, the only other place I've ever read similar stories are for comments for propanolol on various drug-related websites online, where many people seem to indicate that they experienced paralyzing fear from public speaking, and that in many cases propanolol seems to have help them overcome it.

I've never tried it, but I'd be curious to hear if anyone hear had anything to say about it one way or the other. I'm an IC and have been mostly avoiding public speaking lately, but am at a company right now that engages in frequent song and dance shows where people are highly encouraged to get up and give lightning talks and such for everyone else. I've managed to dodge it so far, but there's no question at all that poor speaking skills will be detrimental to my career over the long run and that I need to find a fix.