I too took a public speaking/speech class my first semester of college, and I was sweating buckets the first day afraid that I was going to embarrass myself in front the class. Thankfully, though, the professor told us that if we have anxiety/speech issues we can visit her after class to discuss a plan. I was super grateful because she gave me a longer time to do my speeches, or I was allowed to give my speech to just her and the TA without the entire class present. I would recommend talking to your professor!! I didn’t have a 504 plan or any accessibility letters, but she still made accommodations for me. Though, not all professors will be that kind, in which case I would talk to administration.