If you are that concerned try to get to the clinic early. I make my appointment first thing in the morning and when I arrive tell the person at the desk I am early. Usually I do not have to wait at all. I don't like sitting in clinic room chairs so I just stand and walk around a bit if the waiting room is large. This works. I am usually not in the office for more than 20 minutes. With your symptoms of anxiety you might try to go early in the day to the clinic. It sounds like you could use a check-up to make sure the anxiety is not from any physical problem.