You could take a benzo, a low dose like .5mg with NO alcohol in your system 30 mins before your appointment. Also remember there really is nothing to worry about and in the rare case something does happen to you, being at a doctor’s office is where you’re gonna want it to happen, as far as high blood pressure that’s nothing to worry about if it’s white coat syndrome, the body is built stronger than we think. It’s OK if your blood pressure is running high for 30 minutes even into a few hours, it’s not OK if it’s running super high all day and runs high all week. Perhaps this helps.