Hi there, In 2004 I found out I was pregnant for the second time and I was so scared because I was completely housebound and suffered panic attacks too.
I was so scared of going through labour again to the extent that abortion could have been the wway for me to go!
How I think about it is, there are people out there with 6 kids and still they go back for more.
When I was in labour there was very little worry and when you are in full blown labour I was concentrating that much I didn't feel any different to the way i felt when I had my first son (before I suffered anxiety) than I did with my second...
I am sure you will be fine
Good luck.
I wish you all the very best with your pregnancy, birth and 2 children