You will hear a lot of different opinions. I am kind of known throughout all circles as Ms. Neurotic USA Worry is my middle name.
For me the worry was soooo fierce at first. Every day I waited for bad news. To this day I think about cancer every every day. I never thought I could have a happy moment again. I do have to say though that over time you get more used to your "new normal" and we have found happy times that we never thought we would ever find again.
The fear and anxiety especially increases during test times, but you will just start to get used to your new normal in time.