Extreme Anxiety

Has anyone else had extreme anxiety from time to time about bringing a child into this world? I was at a lunch meeting today with two older men who have grandchildren, and another female who was pregnant with her second child. 
They were all laughing about the stuff kids do, and all I wanted to do was rush to the bathroom and start bawling. (If you couldn't tell, this is my first). 
I understand that my feelings are normal, but I am looking to see if anyone has found any relief / tricks to ease the worry. 
I know I will do my best to be a good mom, but I need to get through these next 2 months!