monkor, congratulations on your pregnancy, and I'm very sorry you are having an anxious time of it so far.
I don't think there's a pregnant woman alive who doesn't have some anxious thoughts about labour - however, and this is a BIG 'however', there are some women for whom this anxiety is so great that it crosses into the territory of genuine phobia. A phobia of childbirth is sometimes called tokophobia.
(if it helps, think of the difference between being feeling down and miserable, and clinical depression. Or the difference between being shocked after a scary event, and Post Traumatic Stress Disorder.)
Only you know how you really feel. I'm not replying to 'diagnose' you in any way! that would be incredibly silly - but I would ask you to consider seeing a doctor you know is sympathetic (wish they all were, but they aren't) and describing your feelings as accurately as you can. I would let them know this is a longstanding fear, and make sure they listen to what you are saying. (you don't need to know WHY you feel like this - plenty of people with depression have no idea why they are depressed, but that's ok.)
There are all sorts of things that can help you, whether it's a case of alleviating 'normal' fears, or dealing with a phobia. Whatever happens, you already know you don't want to go through nine months as scared as you are now, and you shouldn't have to.
So I would say, you don't need to wait for a midwife's appointment. If it's something which is a big source of anxiety for you, and I think from your post it is, then you can make an appointment with the doctor as soon as you can.