I know how you feel OP. Anxiety is horrendous and you'll get some people telling you "Just deep breath and get on with it". When it's not physical and on show people think it can just be "breathed away" for some reason. Anxiety & Panic disorder when you have it so badly is like a bully, constantly attached to you, getting in the way, getting at you, getting all over you, it's sufforcating.
I feel ridiculous saying this because you probably have, but have you tried beta blockers? They got me through my A level presentations. They weren't enough for Uni though and I left half way through my degree. I couldn't leave my halls, it was one of my darkest times. So lonely and isolating. Lecturers were amazing and tried absolutely everything they could to help - presentations just in front of a small group, counselling services; but I just couldn't go on, my body just froze and ached with terror with I tried to get up and leave - I started to hate my body because of it and would pound on the floor of my room. Cry loudly in the shower. I just wanted to feel normal and confident and join in with the others on my course, but it doesn't work like that - your body does what it wants, you can't control it sometimes, hence the millions of people on medication.
A couple of years later after trying various medication and CBT, I was stood in the shower one day and I literally "told" my anxiety "just do your worst, if I'm going to die at least I'm away from this constant hell" - and after that it sort of eased off, like I'd 'beaten the bully' type thing. It still flares up unexpectedly though - but I can get up and go now and that's everything, that's freedom!
I'm trying again with Uni in 2021 after an access course and hoping now I'm older and mentally stronger I'll be able to do it this time. It's my 2nd chance.
Good luck! I honestly know how difficult it is, and how hard it is to find people who 'get it' xx