I'm another Kiwi from Cantab', and I know how you feel.
All I can say is yes, these are scary, your feelings and reactions are normal, and I know that right now it feels like forever.
For me and my kids, I found that rescue remedy helped, eat if you can, and eat what you can, drink lots of water.
For keeping the kids calm, we played 'guess the magnitude' for each quake, and the winner got a lolly. We all got really good at guessing the magnitude.
What we found to be fairly tried and true for keeping ourselves as safe as we could, was 'stop, drop, and cover'. So basically, get under what is closest to hand and hold the hell on. If there's a table, get under it, and, very important point, hold onto the legs, because in a really good judder, if you don't, you're going to be staying still, and the table is going to be buggering off. Now is a good time to 'fix, fasten and forget', make sure shelves etc are fixed to the walls, blue tak down ornaments, or better yet, put them away for a while. (Some somewhat suspicious breakages occurred in Christchurch - a wife's much loved Lladro figurines, equally loathed by her husband, for example
.
People will say, 'you must stay calm for the children'. Please, do stay as calm as you can for the children, they look to you, to see how worried you are. However, you are human. Sometimes you will react in a way, that later you beat yourself up for. It's okay to be human, try to go away to have a wee meltdown periodicially.
If you can get fresh air and exercise, every day, that helps, as does keeping to your routine.
Kia kaha. Aroha nui. Keep strong. Much love.