Hi!
I have social anxiety as well. I generally do OK if I'm talking about myself so I do that in small talk more than anything else. OR I try to find a common interest and we discuss that. However, I am prone to oversharing so I have to adjust for that but otherwise, it takes a lot of the anxiety away.
I also find making myself busy helps. I go "Hi Ms_________ I'm going to check your IV site", or I fold sheets while talking. I always make small talk while busying myself with something else. It works like mindfulness and helps to ground me. I never do anything that requires my full focus; just something that uses one sense primarily.
Overall give yourself time. Your brain will likely stop or slow down on running laps once you get used to the new stimulus.