I don't know what's changed. Until recently I've never had to deal with problematic anxiety.

My body has been doing some weird things on and off for about a year now. In the course of trying to nail down what is causing it, I'm finding myself increasingly anxious every time I have a medical appointment. 

It's not that I'm worried about a diagnosis (if anything, a definitive diagnosis would be a relief). But something about going to the doctor is lately causing such anxiety that at times I think I'm going to throw up. As soon as I leave the appointment I'm fine again.

I have an appointment with my GP this week to organise for a psychologist. I think this is something I need, but at the same time I'm worried about this appointment because of how I've reacted to the last couple of appointments. 

I don't understand why something that has never been a problem in the past is now so difficult. And because I don't know why I'm reacting this way, I don't know how to deal with it.

Any tips for someone new to dealing with this?