Feeling anxious

I am starting to have some anxiety about the birth. I have been so cranky and impatient with people, and I've been feeling a bit sick to my stomach. I am making an effort to relax, but I feel like any moment now my water could break or labour will begin and I will have to jet to the hospital. I doubt I would be this anxious if I was having a natural birth because there would be no rush. I was definitely more calm about things before I opted for the c-section. I am still looking to God for an answer to that one...