Ok, glad I thought of something to say for you.

Now, breathe! (the milkshake sounds good too lol) Your patient will want to see you not so stressed too, ok? That will help her not be overly stressed. BUT this is a stressful situation for anyone. Don't panic with it. Do your best. God will know you are doing your best, plus, HE promises to give you the words and thoughts HE wants you to have...
it might be your "trial" and it might not be. sigh.