Struggling with Brain Fog During Doctor's Appointments

Does anyone else have problems during doctor's appointments because of brain fog?? I had one yesterday and wrote down everything I wanted to tell and ask him beforehand but when I got in there my comprehension went out the window. He would ask me to describe a symptom and how long it usually occurs and I just could not verbalize properly, I felt like he was a bit irritated about it. I forgot to ask him an important question and had to wait until he finished his next appointment for the nurse to ask him. All the tests and measurements they put me through at the beginning of doctor visits always triggers my symptoms (dizziness, brain fog, etc) and it didn't help that this was a consultation at a new location so I was super nervous. Bad all around lol Any tips for managing brain fog during appointments??