Yes, it can be painful. But, it only lasts a short time. It WAS NOT a jolt to my system, and shame on any nurse who would say that. The doctor should know this was said to you. We're already freaked out at a BC diagnosis. We don't need to be told such things!
Please come back and let us know how you're doing or if you have any questions!
HUGS. Many prayers that you will do well. Remember this. A very high percentage of BC survivors die of something totally unrelated. BC is very treatable.