I can relate to some of what you described.

My nerves are always so shot when I arrive that I immediately have to go to the bathroom - even if I just went before driving there 15 minutes prior. I have started to wait in my car instead of in the waiting room, but it certainly is an awkward feeling to have to address the receptionist and wait for his door to open. It is incredibly stressful, the anticipation.

You are not alone.