Hey guys, 
I have to take my first propranolol dose in 10 hours and I m freaking out. 
I am in sales by profession and I started getting the worst anxiety attacks during presentations. Not sure where it came from. My doctor gave me propranolol but I never took it, afraid it would kill me (I had asthma when I was younger and I feel like I cannot breath when I talk for too long..so in my head the beta blocker will kill me). I ended up leaving my sales job before I got fired because I was clearly unable to sell software. 
Now I have a presentation for a job I m applying for in 10 hours. And I have thought about taking the beta blocker because I do not want to fuck this up. But I m so scared.
If I don’t find a solution for my stage freight I will be jobless for a long time. 
I am wondering if it’s a bad idea to take my first dose this time? Not only am I afraid of my breathing, but also that I ll become tired or dizzy. 
I take oxazopam every night for my anxiety. 
My BP is within the normal range (sometimes lower). I had asthma when I was younger but grew out of it although I cannot walk for too long at a certain pace without feeling like there is not enough air in the world for me to breath in. 
Am I overthinking this? What should I do?