NO basis for feeling this way? Lovie, you just found out your life is going to change forever! Not to mention you have a zillion hormones running around your body right now.
And you need to tell your doctor and be insistent about how you feel. You need to be an advocate for you!
It doesn't make sense to say, "Oh, they'll just tell me to suck it up so I'm not even going to say anything..." Why suffer in silence? You have a right to feel crappy.
It is also a perfectly, 100% normal to feel what you are feeling. I felt it too, despite wanting pregnancy, and wanting the baby so badly, I felt like my life was now over. And that was with my SECOND child.
Tell someone. ((hugs))